# Converging lens lab report

8. Lab 9 - GEOMETRICAL OPTICS OBJECTIVES To examine Snell’s Law To observe total internal reflection. In this experiment, we will be dealing only with thin lenses. Be careful here because the lens is not in the center of the holder, so you should measure the distance from the center of the lens-holder to the center of the lens and then either add or subtract to the distance to get the correct value of xo or xi. Record this value in your notebook as the focal length of the lens. You must do this for each of the two converging lenses and record their focal length. A convex is lens is thicker the further to the centre of the lens. 27, No 2. ← Measuring The Focal Length of a Converging Lens. 7, 6. Margaret Wettergreen PHY 2049L 03/27/2014 Lab #10. Include the drawings with your lab report. OBJECTIVES 1. You will have three main tasks in this lab: Measure the focal length (f) of converging (bi-convex) lenses The experimental work consists of forming images with converging and diverging lenses, and determining the location and magnification of the images for comparison with Eqs. HomeworkHelp) submitted 4 years ago by MATH_GOD ection and Refraction Physics 227 Lab Sign Conventions for Lenses The focal length, f, is + for a converging lens The focal length, f, is - for a diverging lens The equipment You will be using a Ray Box throughout this lab. Introduction. For example, a simple converging lens can concentrate enough sunlight (striking the Earth as parallel rays) to start a fire on a dry sheet of paper. 5. MEASUREMENT OF THE FOCAL LENGTH OF A CONVERGING LENS Apparatus Converging lens, screen, lamp-box with crosswire, metre stick, retort stand. Convex lens; Given convex mirror; Real Lab Procedure: Place a convex lens on a stand facing the illuminated wire gauze at a fixed distance, say 30 cm, away from the wire gauze. Converging lenses. Background Experiment 22: Thin Lenses 127 Rays of light from a nearby object will arrive at the lens at various angles. 4: Ray Tracing: Nearby Object As mentioned, a diverging lens will usually form a In this two-week lab, we will be exploring the behavior of light and lenses. 4). The ﬂuorescent portions of the specimen then emit green light. Presbyopia is the loss of accommodation due to old age, which results in far-sightedness. Lenses are classified as one of two types, converging and diverging. 2: Locating Images in Lenses Investigation 13. . Object: To measure and compare the focal lengths of some lenses using different methods, and to determine the magnification of a simple telescope. For a converging lens, the following should be true. Part I: Thin Converging Lens This experiment is a classic exercise in geometric optics. The three conventional rays for your ray tracing diagrams are illustrated below: In the first diagram, a converging lens is shown, and three rays are drawn: Ray 1 (top) passes from the tip of the object parallel to the lens, then through the focal point F’. This point is known as the focus and the distance between the centre of the lens to the focus is called the focal length of convex lens. Your name: _____ Print this page, record your answers on it, and show it to your lab TF at the start of your lab session. Focal Length of a Converging Lens. 16 Jun 2015 Parallel light rays approaching a converging lens will converge at . Jefferson Lab 8,531,590 views. Diverging Lens: Since virtual images cannot be displayed on a screen, we must use a different technique to determine the focal length of a diverging lens. Then I would go into the hospital information system to review somebody's chart, and see a progress note from Tyler that said the patient's lab report was. Converging Lenses. The lens is set up in a suitable holder with a plane mirror behind it so that light passing through the lens is reflected back again (Fig. Lab Report. 2. Investigate and verify the Thin Lens and Magnification equations 3. erical Lenses BLE Convex lens: Ray diagrams d. Expectations for Lab 12A Image Characteristics of a Converging Lens Purpose: “To… “ use the Question to create an appropriate purpose statement Hypothesis: 5 Ray diagrams for the 5 scenarios provided in ‘predictions’ section a-e Materials: clearly labelled diagram of the set-up (no additional list required) Convex Lens: Definition, Equation & Examples Ray Diagrams & Lenses: Physics Lab A convex lens is also known as a converging lens because it bends light towards a single focal point. Q23) Thinking about the images you created when standing close and far from the bulb in lab and then the distant object, describe what ways are the images similar and Geometrical Optics Pre-lab Assignment. agneswindram find the focal length of a lens (converging) using the lens equation. Is it thicker or thinner in the center? We will begin with the simplest possible optical system: A single converging lens. A converging lens focusses rays from infinity so that they intersect at a common point, more or less. We shall explicitly consider the errors that accompany BTW: Using the Sun is not the safest way to measure focal length directly if your lens is of a large apeture. A converging lens is a lens that converges rays of light that are traveling parallel to its principal axis. Adjust the Lenses and images The lens equation relates the object distance, the image distance and the focal length: we derive that equation here. Convex and Concave Lenses (page 19): Use ray tracing to determine the focal lengths of lenses. In this lab, you will study image formation using converging lenses. Figure 22. Part I. This is even better – a lens simulator (but it runs on Flash). The glass lens which is thicker at its center than its edge is the converging lens. This will be done as a lecture-demo at the start of lab. Experiment to measure the size of microorganisms under microscope! Explain this in your report. Take the f= 50 mm mounted lens out of the box labeled ‘HeNe Optics’ and mount it in a lens holder that is connected to a post of appropriate length. Object pin should be at zero. I've done everything as stated in the procedure. The wavelength λ of the light used can then be found by using the formula S = λL d (2) 2. (Hint: Parallel light, as from a distant object, is focused very close to the focal point of a converging lens. Figure 17 illustrates the paths of the rays through the lens and the focal point for each case. Determine the focal length of the diverging lens supplied by the lab assistant. 3. Geometrical Optics. Place the light source, a converging lens, and the screen in holders along the optical bench. If you've used a . Converging lens Take a converging lens and examine it. Mount the two converging lenses so that they are separated by some distance. Procedure. In each case, position your eyepiece lens where you see the sharpest image in black and white (i. To find the focal length of a converging lens. To do this you will need to use the real image from a converging lens as a virtual object for the diverging lens to produce a real image. Mount a large 3” diameter lens with a focal length of 10cm (4”). to the question raised in the Purpose of the lab. The application of the thin lens equation and the magniﬁcation equations to single and compound lens systems will be investigated. An expanded view of the path of one ray through the lens is shown, to illustrate how the ray changes direction both as it enters and as it leaves the lens. You can also illustrate the magnification of a lens and the difference between real and virtual images. Experimentally determine the focal length and magnification of a convex ( converging) lens (lab report). HYPOTHESIS: The relationship between u and v and the focal length f for a convex lens is given by . Theory: The thin lens formula is: where d o (the object distance) and d i (the image distance) are both measured from the lens, and f is the focal length. o Thin symmetrical lenses have focal points on each side. The first lens controls the magnification level of the image by moving toward or away from the object. Each student works with their own lens (identified on the lens as student 1 and 2). Lens and Mirror Inquiry Lab In addition to the above, you can switch to a mirror by tapping the “LENS” button at the top of the screen. Background lens. The focal length of a lens is an indicator of the distance from the subject: the images are all framed the same. 01 cm. Geometric Optics 2. APPARATUS: Convex lens, optical bench, light source, target image slide, lens mounts, and screen. Objectives of the experiment: To determine the focal length of a spherical convex lens. Due to light travelling slower through glass, it forces the light waves to bend on the top and bottom of the lens producing a focus point in the image distance. Purpose. 2 Introduction 10. The provided convex (converging) lens will be inserted between the light source (object) and screen. To be included in your lab report. The goal of the experiment is to be able to analyze ray diagrams so as to determine fundamental properties of image formation. Without this, the practical would be incomplete. Students are better able to do the experiment in the real laboratory once they understand the Experiment 2: Measuring the Focal Length of a Converging Lens (5 minutes). of a diverging lens below, and report the measured power of the glasses or of the converging lens (s' for that lens), and its known focal length, measure the location of the In reporting the results of an experiment, it is as essential to give the Title: Finding the focal length of a lens using the ray box. Place the lamp-box well outside the approximate focal length – see notes. Use a light source, optics bench, lens, and viewing screen to measure object distance, image distance and size. Converging Lens Goal: To measure the focal length of a converging lens using various methods and to study how a converging lens forms a real image. Move the lenses to form a sharp image of the object on the screen. The same lens can be used in subsequent labs of if measurements need to be redone for this lab. 05 - PhET Interactive Simulations The focal length for convex lenses never changes with it being on the power of the lens. Lab 3: Lenses 1 Introduction Refer to Appendix D for photos of the appara-tus In this lab, you will investigate diﬁerent methods of ﬂnding the focal length of a convex lens. Place a screen, at the other side of the lens so that the wire gauze, lens and screen are in a straight line. •To learn how to make a scale “ray diagram” for a combination of a positive and negative lens Cover Page for Lab Report – Group Portion Compressible Flow in a Converging-Diverging Nozzle the slit and knife-edge are located at the focal point of lens The medium outside of the lenses has an optical density * of 1. Move the tip of the "Object" arrow to move the object. Preparation Review the laws of reflection and refraction and Snell's law. When we used an optics bench and a candle to figure out the focus, it was 16. For!combinations!of!lenses,!the!key!is!to!remember!the!following:!!the(image(of(the Lab 10 Concave Lenses and Lens Combinations Author: Darrin Johnson Then measure the focal length of your glasses as in Additional Credit Part 1, or measure the focal length of one of the unknown lenses supplied in the lab. SPHERICAL MIRRORS LAB REPORT. The problem that i have is that when i am calculating the magnification in two differents ways i. unm. As you work on your lab report include the summery of your observations into it. The difference between mirror and lens is that mirror means a smooth and highly polished glass surface, through which images are formed by reflection, as the light falls on it. 10. Simulated Lens Experiments. What is the focal length of the lens? My task was to determine the focal distance and the magnification of a converging lens. The focal length of the lens is positive if the lens is converging, so that the image focus is located behind the lens, and negative if the lens is diverging, so that the image focus is located in front of the lens. When f is measured in metres the power has a unit called the Dioptre (symbol D): Power = 1/f (2) This number is the one opticians use to figure out the kind of lenses you need. Focal length is defined as the distance at which a lens (or mirror) will focus to a point light from a source very far away. Because one lens has a large focal length and the other lens has a small focal length, you will use This means the actual focal length will be higher than listed – something I explain in Section 4. We attempted to track the distances between the lens and the light source (the object distance) and the lens and the screen (the image distance), which would produce the real images. a converging lens. O. A common Gaussian form of the lens equation is shown below. Please submit a short lab report which includes answers to the questions asked, and the ray diagrams requested. These type of lenses can converge a beam of light coming from outside and focus it to a point on the other side. 4. Experiment 4-Finding the Position of a Virtual Image converging. Are eye-glasses converging lenses or diverging lenses? Explain. Experimentally measure the image distance and con firm the thin lens equation. Lens: A transparent material bound by two surfaces, of which one or both surfaces are spherical, forms a lens. Connect a base to a post holder, and slide the post into the post holder. Focal Length of Convex LensB11 Lab Report. Physics 111: Elementary Physics. ) Such a lens is called a converging (or convex) lens for the converging effect it has on light rays. e. A thin lens is a lens whose thickness is negligible when compared with the distance from the lens to the principal foci or any objects or images concerned. The light rays will then refract as they pass through the lens and, for a converging lens, form an image at a distance d i (refer to Fig. Move the screen until a clear inverted image of the crosswire is obtained. Determine the focal length of your converging lens. Equipment: Converging and Diverging Lenses Converging Lens Lab Diverging Lens Worksheet Read pp 551-553 Do q's 2-6, p 553 Watch: Convex and Concave Lens Watch: Ray Diagrams - Lenses 17 Images formed through Converging Lenses Lens Worksheet 18 Activity 13. Chris McMullen has over 20 years of experience teaching university physics in California, Oklahoma, Pennsylvania, and Louisiana (and has also taught physics to gifted high school students). To find the focal length of a convex lens by plotting graphs between u and v or between 1/u and 1/v. * Predict the location of the final image formed by 2 converging lenses in combination. e. Most camera lenses consist of a converging lens followed by an diverging lens followed by a second converging lens. Introduction to Lenses. 1. A converging lens is a simple magnifying glass when the object is within one focal length of the lens. In this lab we will only be dealing with positive converging (convex) lenses. In this experiment the lens is first PHYSICS 289 Experiment 8 Fall 2005 Geometric Optics − II Thin Lenses Please look at the chapter on lenses in your text before this lab experiment. OS-8515C Experiment 12: Focal Length and Magnification of a Thin Lens Converging lens of unknown focal Focal Length and Magnification of a Thin Lens 34 It might focus to far in front or too far in back. The distance between the convex lens and the image, measured roughly with a meter rule would give the approximate focal length of the lens. The point where all rays which enter the lens parallel to its axis are brought to a focus is called the principal focus. ) PHYSICS 1040L LAB LAB:7 LENSES AND IMAGES . Science SNC2D Lab Report: Images Formed by a. Imaging properties of a converging lens. > 2f Calculation of d, for object at Experimental focal length f Average lens. Draw you diagrams and record your observations on p. Auxiliary Materials: None Scoring Rubric: RL10. Lens Focal Lenght Thin Report by Fildia Putri 1. Move the paper until you get a sharp image of the world outside the windows, or a distant object such as a tree. Target group: and report results. This log will become your lab report. A light ray that enters the lens is an incident ray. The Moon would be safer to use as your object. Equipment: · Lenses refract light to form images of objects. Here are the results I drew up, and the questions. lens of a lens is the distance from the principal focus to the optical centre. Lab Report RC circuits Exam 4 June 2015, questions and answers Diffraction and Interference Meters 03 Lab Report Worksheet Faraday's and Lenz's Laws-2 - In Class Final, questions Webassignch 16 - WebAssign ch 16 Converging Lens This is only a guide for you to follow as you carry out the lab. Ray diagrams are constructed by taking the path of two distinct rays from a single point on the object. You will be provided with equipment to explore the laws of refraction, how lenses work, and how to use them to make simple instruments. a. The objectives of this laboratory are a. provided, one positive (converging/convex) and one negative (diverging/concave). At the end of this lab, we were able to 1. Based on the focal lengths of the lenses, which you have found earlier, predict the distance from the second the lens is called the focal length of the lens. 5. If this is a written formal lab (as indicated on the lab syllabus/calendar), you will have until the next lab to submit the write up to the appropriate assignment in Moodle. Watch how the image changes when you adjust the focal length of the lens, move the object, move the lens, or move the screen. Lab 3 – Measuring Focal Length of Converging Lens. Remember that lab write-ups should have everything in a correct order – there should be no page flipping to find your data and other information. This forms the combination of lenses. Report Questions. A. Reflection and Refraction with the Ray Box lab report. Lab Procedure for Thin Lenses Please don’t mix up the units. Adding a second lens with a positive focal length f 2 and separating the two lenses by the sum of the two focal lengths −f 1 +f 2, results in a beam with a radius y 3 = θ 2 f 2 and A modified converging lens is what they need. The distance from the center of the lens to the principal focus is called the focal length of the lens and is represented by the variable, f. The Ray Box will be used as a source of parallel light rays. The goal is to measure the radius of curvature and focal length of a single converging lens from which you can calculate the index of refraction n. When the object is beyond one focal length, a converging lens produces a real, inverted image. It creates an image at a distance of x’ + f from the second principle point in image space. Enough about lenses. NCERT Class 10 Science Lab Manual – Image Formation by a Convex Lens. A convex lens is also known as a converging lens. 2 The Fresnel Birpism A Fresnel Biprism is a variation on the Young’s Slits experiment. 3-1 and 3–3. Lab 2: LENSES, LENS SYSTEMS, and SIMPLE OPTICAL INSTRUMENTS (2 Lab Periods) Objectives Measure focal lengths and magnifications of thin lenses and thin lens combina-tions. converging lens is strong enough, it will be possible to form a real image. . Figure 1. phys. e M1=b/a and M2=h'/h where a=distance form object to mirror, b In this lab we will apply the thin-lens equation to the measurement of the focal length of a converging lens and of a diverging lens. Thin Lenses 8. Top . Repeat the same steps with diverging lens. Converging lenses can produce both real and virtual images. 1 Purpose In this lab, you will measure the focal lengths of two lenses and use them to construct a simple telescope which inverts the image like the one developed by Johannes Kepler. experiment lens march 24, 2016 callais purpose the purpose of the Converging lenses have a focal point on the side of the lens opposite of where the. Write-Up. To discover how lenses form images. Lenses Lab Measurement of the Focal Length of a Converging Lens A. The definitions for optical axis, focal point, and focal length given for curved mirrors hold true for lenses Two lens system – Image distance and magnification Home Problems and Answers Optics Two lens system – Image distance and magnification Two converging lenses, with the focal length f 1 = 10 cm and f 2 = 15 cm are placed 40 cm apart, as shown on the figure. On the other extreme, a lens is a part of transparent refracting medium, (i. On the other hand, if the diverging lens is weaker than both converging lenses, combine two diverging lenses together. Introduction: The purpose of this experiment is to determine the focal length of a converging lens using 5 different methods. to test the predictions of the thin lens equation when more than one lens is used to produce an image of an object. 5cm from the target Percent difference: 40. 24. Image Formation with Converging Lenses - Java Tutorial. 2 Read pp 556-560 Do q's 1-8, p 561 19 Converging and Diverging Lenses. Light diverging from the primary focal point and approaching a converging lens will exit the lens with the rays parallel. Finding the focal length of a converging lens • Choose a place to put the converging lens. A lens is usually made from glass. If the surfaces are approximately spherical and close together, one has what is called a "thin lens". Focal Length of Convex LensB11 Lab Report Objectives of the experiment: To determine the focal length of a spherical convex lens ♦ by “Lens formula method” ♦ by “Lens replacement method”. Measure the distance v this experiment. Telescope using the two converging lenses from part 1 of this lab. As an example, a convergent lens forms a real image of a candle's flame on a screen wall. Rays going through a lens or lens system, with front principal plane FP, back principal plane BP, and focal length f marked. Here you have the ray diagrams used to find the image position for a converging lens. After conducting the experiment seven times, and calculated the focal length for each we can In this lab, the student will determine the focal length of a given lens by using an optical bench to make measurements of object and image distances. This was about 15cm. The methods used are described below: P31220 Lab 3 converging. To observe the relationship between an object and the image formed by a lens. 8:20 Geometric Optics Intuition with Mirrors and Lenses Concave Convex Diverging Converging | Doc Explain this in your report. This is the form used in most introductory textbooks. ” It is made by light from an object passing through a converging lens as shown in Figure 1. In order for the light from the pair to form a real image, the converging lens must be stronger than the diverging lens; that is, fc < fd. Apparatus: Metre rule with holes drilled at the 25cm, 50cm and 75cm mark, 50g masses 50mm long bolt with a diameter of approximately 5mm, retort stand, boss head and clamp, 0-10 N spring balance, electronic pan balance ,wire or string for suspending masses from the metre rule, two Model No. A converging lens similarly corrects farsightedness (picture (d)) 1. Here is a great overview of lenses from Hyperphysics. Place the arrow at one end of the bench and position the converging lens a distance of 4f from the object (as you’ve done earlier). •To learn how to make a scale “ray diagram” for a combination of a positive and negative lens the lens is called the focal length of the lens. Experiments to measure the focal length of a converging lens. Adjust the position of screen to get a clear image of the This image is at the focal point of the lens, s 2 = −f 1, because a well-collimated laser yields s 1 ~ ∞, so from the Gaussian lens equation s 2 = f. converging lens until you are able to form a clear image on the small screen attached to you optics bench. Check it out. Note that the front side of the lens is defined to be the side from which the light is incident. Lenses are categorized into two groups where a single lens has one piece of material and a compound lens has many simple lenses, which have a common axis. Part 1—Focal Lengths of the Lenses Discussion: A converging lens is thicker at its center than at the periphery. Place the Measure the distance u from the crosswire to the lens, using the metre stick. K. You will then ﬂnd the focal A convex lens of short focal length; Concave lens; Real Lab Procedure: Keep the given convex lens of known focal length, f 1, in contact with the concave lens whose focal length to be determined. Move the point named " Focus' " to the right side of the lens to change to a concave lens. Lab Partners _____ Purpose: * Determine the focal length of a converging lens using various object and image distance combinations. PHYS 2212L - Principles of Physics Laboratory II Laboratory Advanced Sheet Thin Lenses 1. lab reports, optics. Converging lenses Mirror Lamp Optical track Ruler ; Open a Microsoft Word document to keep a log of your procedures, results and discussions. In our study of lenses, we saw that if the source was placed within a focal length of a converging lens, the lens yielded a magnified image on the same side of the lens as the source. Lens Simulator. Introduce the Thin Lens Equation and Magnification calculations for simple optical systems 2. CONTACT ME: Prof. Physics 20 Concave Mirrors Lab Part 1: Finding the Focal Length of the Mirror (fmeasured) Place your mirror, in its holder, on a convenient point of one metre stick (such as the 10 Let me tell you something about lenses and images and then just let you do the lab as you see fit. Thin Lenses. d. 3cm. Learn how to draw image or be able to construct image formation of the different forms of mirrors and lenses or ray diagrams. Images with Thin Lenses Goals •To learn experimental techniques for determining the focal lengths of positive (converging) and negative (diverging) lenses in conjunction with the thin-lens equation. The Focal Length of a Thin Converging Lens Introduction The ability of a lens to focus light is a consequence of its shape and optical density relative to that of the surrounding environment. Measure Reflection and Refraction Equipment Acrylic block set, plane-concave-convex universal mirror, cork board, cork board stand, pins, flashlight, protractor, ruler, mirror worksheet, rectangular block worksheet, equilateral prism worksheet, converging lens worksheet. A convex lens is thicker in the center than at the edges and can also be called a positive lens or converging lens. Objectives. A converging lens causes parallel rays to converge, and a diverging lens causes parallel rays to diverge. OBJECTIVE: To investigate the image formed by a certain thin convex lens and to determine its focal length. Compressible Flow in a Converging-Diverging Nozzle LED light source with condenser lens and slit The facility used in this lab experiment is a small wind If those surfaces are bent outwards, the lens is called a biconvex lens or simply convex lens. Bernardo, Oliverio D. To understand and use the lens equations. First we work backwards to find the object position of the converging lens, then use this as the image position of the diverging lens. Experiment to measure the size of microorganisms under microscope! CONVERGING LENS | Optics - Flash animation for optics learning - Interactive Physics Simulations | Interactive Physics Animations | Interactive flash animation to learn how to get an clear image of an object on a screen. The focal PHY 124 - Optics: Reflection, Refraction and Images There are two parts to this lab that can be done in either order. Purpose/ Aim / Any lens that is "thicker in the center" than on the edges is generally described as a convex lens and will function as a converging lens when it is operating in air. Physics 4 Laboratory Snell’s Law, Lenses, and Optical Instruments Prelab Exercise Please read the Procedure section and try to understand the physics involved and how the exper-imental procedure works. Experimentally determine the focal length and magnification of a convex (converging) lens (lab report) 4. LENS Apparatus Converging lens, screen, lamp-box with crosswire, metre stick, retort stand. • Measure the focal length of a diverging lens. This position is located behind the lens and is usually labeled as F in ray diagrams. Converging lenses are used in cameras and several other optical instruments (telescopes, magnifying glass, etc. 8 and in your lab report. lenses (L2 and L3), 1 long focal length double convex lens (L4), 1 double concave lens (L5), A significant portion of the experiment involves measuring the focal lengths of different lenses. In the Geometrical Optics experiment you will examine real and virtual images formed by lenses. Apparatus: Optical bench, light box, lenses, lens holders, illu minated target object, white screen with scale, mirror. In contrast, a . The lens and screen are held in place by magnetic clamps that can be switched on and off. Thin Lens Equation. To say it’s the focal length that changes the perspective is, however, quite misleading. 22. Part A: Planning Equipment: Illuminated object: We will need this in our investigation because we need light for the practical itself. Figure 1 AIM: To determine the focal length of converging lens and it’s radius of curvature. 5 In today’s lab First we’ll become accustomed to forming images using a converging lens and use object and image distances to determine its focal length. A Positive Meniscus Lens is like a converging lens except it is more cosmetically appealing but still maintains a middle that is thicker than the edge. A diverging lens bends rays from infinity so that it seems that they originate from the same point. A convex lens of short focal length; Concave lens; Real Lab Procedure: Keep the given convex lens of known focal length, f 1, in contact with the concave lens whose focal length to be determined. References Hecht, sections 5. In this part of the lab, you will make observations concerning the imaging properties of a converging lens that will be compared to the ray tracing results. the Data Sheet, and turn in the ray diagram with your lab report. • Measure the focal length of a converging lens. ) The converging lens is thicker at its center than at its edge. Hold the lens parallel to a window, put a blank piece of paper behind the lens, away from the window. To discover how a telescope works OVERVIEW LAB: Image and Object Distances with a Converging Lens Theory: From your text or class notes, find the equation that describes the relationship between object distance and image distance for a converging lens. Telescopes and microscopes work on the same basic principle. glass), bounded by two surfaces, of which atleast one is buldged. These lenses can be arranged to show various effects and phenomena. You will verify the predictions of the lens equation (for a thin lens) and understand the transverse magniﬂcation of a convex lens. Physics 41- Lab 5 Determination of Focal Length of A Converging Lens and Mirror Objective: Apply the thin-lens equation and the mirror equation to determine the focal length of a converging (biconvex) lens and mirror. Place the converging lens about 5 cm from the edge of the paper, as in Figure 1. Thin Lens Lab: Description and purpose: In this lab, we used convex convex lenses to project real images on a screen. The known values besides the converging lens focal length f con are the positions x obj, x div, x con, and x im of the object, the two lenses, and the image. Figure 2 Secondary focal point of a converging lens. Had to take measurements of each lens, and the diverging part, we had both a diverging lens and converging lens put together. Return to the lab room. * Calculate the magnification of an image formed by a converging lens. Lab 12. If it’s thinner in the middle, it’s diverging. 7. Differentiate between converging and diverging mirrors and lenses. (10 pts) Purpose Lab 12. 2) Arrange the lens in lens holder of the optical bench. Experiment 1 - Measuring the Focal Length of a Convex Lens (Parallax Method) Experiment 2-- Investigating the relationship between the image and object distance for a convex lens. Lab over 3 lenses: We had one diverging lense, and two converging lenses. An optical bench lets you line up objects and lenses and move them around easily. The focal length of a lens depends on the curvature of each surface. These distances indicate when the image was CLEAR to see on the paper. Some of the www. Have done the experiment with title title “Lens Fcal Lenght Thin”. This Sketch the different types of converging lenses. Equipment was set up on the optics bench so that light shone through a parallel ray lens and then through a slit plate and then onto the concave or convex mirror situated on a ray table. O B J E C T I V E S Measure the focal length of the converging lens and record it in the Data Table as fcon. Presbyopia. Essay Physic Lab Report Parallel Force. o Concave lenses are diverging systems and will only produce virtual, upright images. Convex lens: Convex lens is a transparent curved device that is used to refract light. D. January 1988 • “Measurement of lens focal length using multi-curvature analysis of Shack- (d) A lens which converges a bundle of parallel rays is called a converging lens, or positive lens (its focal length is taken as positive. Converging lens, screen, lamp-box with crosswire, metre stick, retort stand. By using a second lens, it is possible to extend the measurements into the virtual-object region. Description of Procedure: A converging and a diverging lens are distributed to each student lab group. You can see that it is + for a converging lens and - for a diverging lens. It is the point where the image comes into focus when seen though the lens. edu LAB 6 Thin Lenses . > 2f Calculation of d, for object at Experimental focal length f Average converging lens Demonstrates some understanding of image characteristics in a converging lens Demonstrates limited understanding of image characteristics in a converging lens Presentation Language & Completion The report is easy to read with no errors in spelling or grammar All required parts of report are complete and in correct order B. The parallel ray lens had to be adjusted to make the light rays project in a parallel fashion onto the mirror. Determining the Focal Length of a Positive (converging/convex) Lens We will be using the optical bench with the light source and the viewing screen to determine the focal lengths of the two lenses provided, one positive (converging/convex) and one negative (diverging/concave). If you use this method, please feel the lens through a piece of cloth or lens tissue to avoid putting fingerprints on the lens. Thin Lenses and Optical Instruments Equipment 1 meter optical bench with 5 moveable mounts, lighted test object, 3 lens holders, screen, 2 short focal length double convex lenses (L1, E1), 2 medium focal length double convex lenses (L2 and L3), 1 long focal length double convex lens (L4), 1 double concave lens (L5), collimating mirror and slide the lens forward a distance x so that it focuses an image of the source on a second source across the lab table. To compare both methods. Dr. Equipment: Optical bench Converging Lens and diverging lens Light source as an object Viewing screen Mirror Half-screen Procedure: PART I. 1(5) - Prism How does the tilted lens effect the location and shape of the focal point? D. Move the screen until a clear inverted image of the crosswire is (The axis is defined to be a line normal to the lens at its center, as shown in Figure 1. Departement of Chemistry, FMIPA State University of Makassar 2013 Abstract. Also, the magnification is defined as: Ok. Adjust the positions of the lens and screen until a clear image is formed on the screen. Thin Lenses Physics 227 Lab What You Need to Know: From last week’s lab, Re ection and Refraction, you should already be fa-miliar with the following terms: principle axis, focal point, focal length, f, converging lens (f +), and diverging lens (f -). Hollow Lens (page 21): Use the hollow lens and water to explore how the prop-erties of a lens are related to its shape, its index of refraction, and the index of refraction of the surrounding medium. Simulation of image formation in concave and convex lenses. Converging lens of the lens which they used. Lenses – Finding the Focal Length of a Convex Lens Hold the lens up to the window and hold a piece of paper behind it (on the other side of the lens from the window). This experiment uses a double convex lens (a magnifying glass) on your desk. So the more highly curved the surface, the shorter is the focal length and visa-versa. Lab Preparation The picture on the screen in a movie theater is called a “real image. AIM. 18% +75 mm B. The purpose of this experiment is to verify the thin lens equation and to construct simple optical systems using various combinations of lenses. In this experiment you will find images created by lenses and mirrors and study the laws that describe them. Equipment: < Optical bench < Converging achromatic lenses with focal lengths of about 13 cm and 60 cm Then measure the focal length of your glasses as in Additional Credit Part 1, or measure the focal length of one of the unknown lenses supplied in the lab. 8 Geometrical Optics Double Concave lens. If these concepts aren’t fresh in your head, then review last week’s lab. ). Irv Robbins (CSI-CUNY) On first day we meet we cover some basics and you get an introduction to the Lab 9 - GEOMETRICAL OPTICS OBJECTIVES To examine Snell’s Law To observe total internal reflection. If the lens equation yields a negative image distance, then the image is a virtual image on the same side of the lens as the object. This is, of course, the detective's best friend, the magnifying glass. Basic Optics System About the Experiments 8 6. Q23) Thinking about the images you created when standing close and far from the bulb in lab and then the distant object, describe what ways are the images similar and Lenses – Finding the Focal Length of a Convex Lens Hold the lens up to the window and hold a piece of paper behind it (on the other side of the lens from the window). A lens holder, a converging (convex) lens, an optical bench, a light-bulb socket, a low-watt light bulb, a rectangular target, a target holder, and a tape measure . Figure 3: . It has two forms depending on how the distances are measured. Theory: In this experiment, we have chosen two methods to find out the focal length of a spherical lens. Hypothesis Our hypothesis is that the closer an object is to a converging lens, the greater its magnified image will be. What is the focal length of the lens? Experiment to find a way to estimate the focal length of your converging lens. Materials: Converging lens, lens holder, object of your design, white viewing screen, 1 meter Use the +100 mm lens as the eyepiece for your astronomical telescope. Using an illuminated object and plane mirror. The image in inverted. If it yields a negative focal length, then the lens is a diverging lens rather than the converging lens in the illustration. Lamp-box with crosswire Lens u v Screen Procedure 1. Move the point named " Focus' " to change the focal length. Investigate the aberration of a thick lens. Lenses produce different types of images, depending on the position of the object relative to the lens and its focal point. Physics Lab Report: Parallel Force Aim: To test the principle of moments. We will begin with the simplest possible optical system: A single converging lens. Parallel incident rays pass through the lens and converge to a real focus on the opposite side. Using the common form of the lens equation, i is negative. Physics 208 - Lab 2 - Ray Optics Set up a lamp, a converging lens, and the screen on the optical track, as shown. the completed report file directly to a lab TA or to physics@andrews. We will be using the optical bench with the light source and the viewing screen to determine the focal lengths of the two lenses. They can be identified by their shape How does the tilted lens effect the location and shape of the focal point? D. Lab 14 Image Formation by Thin Lenses Objective: < To observe the relationship between the distances of an object and an image from a thin lens. ♢ by “Lens formula method” . Draw a diagram (opical axis), lenses, and label object and image locations and record distances. A form using the Cartesian sign convention is often used in more advanced texts because of advantages with multiple-lens systems and more complex optical instruments. 12). , tangent to the front and back surfaces. Distant Object Each team of students should pick up a converging lens from the instructor, these should have focal lengths somewhere between 5 and 15 cm. Sample results for the lens investigation. Find the focal length of a convex mirror using a convex lens. Both the green light and then blue light then pass back through the objective. Apparatus Optical bench, Incandescent light source with cross arrow plate, Viewing screen and holder, Converging lens (marked 75 mm) and holder, Diverging lens (marked –150 mm) and holder, Plane mirror PYL 106: Lenses and Diffraction . Compressible Flow in a Converging-Diverging Nozzle LED light source with condenser lens and slit The facility used in this lab experiment is a small wind Virtual Image Formation. The most accute way to measure focal length of a lens (especially a short focal length l In the first method we will use a converging lens ahead of a diverging lens to converge the rays before they reach the diverging lens thus using the image of the converging lens as the object for the diverging lens. Then we will form an image with a two lens system, using a converging and diverging lens, to determine the focal length of a diverging lens. Lenses of different sizes, focal lengths and types are available along with lens supports, optical benches and its accessories. Then, you use a second converging lens (the eyepiece) as a magnifying glass to magnify that first image. Such images are formed with the simple magnifier . A lens is an optical device that is trans-missive, and which affects the resultant focus of a light beam. Your lab report for this experiment should contain the following sections: 1. THEORY: A thin convex lens can be characterized by its focal length f, the object distance, d o Conclusion: From the results of the lab we calculated the focal length of our converging lens to be 19. Ray Diagrams & Lenses: Physics Lab This schematic shows an example of a convex lens on the top and a concave lens on the bottom. Test of lens equation for converging lens Discussion: For a thin lens of small aperture, the following relations hold: 11 1 pq f += (1) where p is the distance from the object to the lens, q is the distance from the lens to the image and f is the distance from the lens to the principal focus (sign conventions as in the reference), and The objective is a converging lens that focuses the light down onto the sample under observation. To discover how a telescope works OVERVIEW Lab Partners _____ Purpose: * Determine the focal length of a converging lens using various object and image distance combinations. LENS FOCAL LENGHT THIN Fildia Putri, Rafika Sri Rahayu , Nul Lailah , Nurul Wisna Afianti, Nur Rahmah Marisa Raden. Apparatus: Biconvex glass lens, spherical concave mirror, meter ruler, optical bench, lens A converging lens always has two focal points, the primary focal point on the near side of the lens (towards the oncoming light rays) and a secondary focal point on the far side of the lens (away from the oncoming light rays). Microscopes usually employ at least two lenses together — but, as we are only beginning to learn about light, we will be exploring single-lens systems. A converging lens can produce a real image (where the light focuses to an image). 8:20 Geometric Optics Intuition with Mirrors and Lenses Concave Convex Diverging Converging | Doc Science - Physics - Lab Report. edu. Students will be asked to make additional observations to further their knowledge of lens properties. to be able to measure the focal length of a converging lens. 2, 5. The virtual image created by the diverging lens acts as the object for the converging lens. Converging lenses form virtual images if the object distance is shorter than the focal length. For example, a thin converging lens, typically made from some type of glass, is fabricated into the shape of two spherical Lab Assignment: Converging Lenses Laboratory: Introduction This lab will demonstrate some of the principles of converging lenses. Measure the distance from the object to the nearest lens and the distance between the lenses. Focal length of converging lenses by plotting 1/d0 and 1/di Using lensmaker's equation Converging lens (Positive lens) Distance at which the image is focused is recorded A +75mm converging lens is placed at about 35. Construct a simple optical instrument from thin lenses and measure some of its properties. #2. Experiments to measure the focal length of a converging lens Method (1). The experiment is to enable students to physically observe the image produced by the lens. Chapter 8 The Telescope 8. b. You see, it’s the distance from the subject. Now restart the simulation with a combination of a convex and concave lens by 24 Apr 2018 EXPERIMENT. Measure the distance u from the crosswire to the lens, using the metre stick. Positive, or converging, thin lenses unite incident light rays that are parallel to the optical axis and focus them at the focal plane to form a real image. Theory A lens is a transparent THEORY: A thin convex lens can be characterized by its focal length f, the . relationship between the convex lens and the focal point. This experiment may be done at home and included with your lab report. lens is a piece of transparent optics, usually glass or plastic, that causes parallel rays of light to converge toward the central axis of the lens. • By moving the screen, focus the image. 2. Converging Lens Presented to Mme Neena Acadmie de la capitale. The image is then virtual, magnified, and right-side up. Determine the focal length of a diverging lens using the Lensmaker’s equation. 1: Lenses Purpose: The purpose of this lab was to study object-image relationships by observing the characteristics (such as magnification and orientation) of real and virtual images formed by a thin lens using an optics bench and a light source. Determining the Focal Length of a Positive (converging/convex) Lens. Sketch your plan for measuring the focal length of a diverging lens below, and report the measured power of the glasses or of the unknown lens. A concave lens is thinner at the center than at the edges and can also be called a negative lens or a diverging lens. One use of refraction, the bending of light rays, is lenses. Measure the focal length (f) of converging (bi-convex) lenses; Measure how the A converging lens (such as the first plano-convex lens below) is thicker at its The triangular end of the rhombus is used as a prism in this experiment. You can set it for white light rays or for colored light rays. The values 22 Mar 2013 Experiment 8. Title of of lenses used in this lab: convex (vexed or bowed outward) and concave (caved or . The location of the image depends on how close the object is to the focal point. The optical densities of the lenses are 1. Use a meter stick to measure the distance from the lens to the paper in centimeters. Converging Lens. [University, Physics 103, Non-calculus]Regarding converging lenses, how can one determine the smallest possible value of a distance "q", since f > 0, that is, f is positive? Answered (self. Answer all questions. Set your ray box to send out a wide beam of light and hold it about a metre away from your lens. LAB 10 Lens Lab- The image from a converging lens Purpose: To locate, diagram and view the image formed by a converging lens. Soares, Applied Optics, Vol. Since the lens was previously one focal length away from the original source, x + f is now the object distance. Where f is the focal length, u is the distance between the object and the lens v is the distance between the image and the lens. Materials Required: Converging lens; diverging lens. 1 Purpose In this experiment, the formation of images by concave and convex lenses will be explored. Explore the difference between converging and diverging lenses and determine their focal lengths. o Convex lenses are converging systems and can produce real, inverted images or virtual, upright images. (e) A lens which diverges a bundle of parallel rays is called a diverging lens, or a negative lens (its focal length is taken as negative. The Lens Equation Lab Included, labeled and organized all parts of the lab report. Chapter 10 Thin Lenses Name: Lab Partner: Section: 10. Move the screen until a clear inverted image of the crosswire is The wavelength λ of the light used can then be found by using the formula S = λL d (2) 2. BTW: Using the Sun is not the safest way to measure focal length directly if your lens is of a large apeture. You use a converging lens (the objective) to form a real (first) image as you did in the "Converging Lenses" section. Exercise 1. June 13, 2014 1. Your report should Lens power is a measure of its ability to magnify or diminish an image. There are two surfaces (air-to-medium and medium-to-air). we used a converging lens and a screen with white paper in front of a window to form an image of a distant tree outside. This demonstration was created at Utah State University by Professor 515 lab report from Byron Cocilovo • “Evaluation of the focal distance of a lens by Talbot interferometry”, Luis M. She hopes that she will be able to develop an apparatus for a Answer to Converging Lens This experiment uses a double convex lens (a magnifying glass) on your desk. The most accute way to measure focal length of a lens (especially a short focal length l PREPARATION ASSIGNMENTS INCLUDE READING ASSIGNMENTS, QUESTIONS TO ANSWER TO HAND IN AND FOR YOUR LAB REPORT PROBLEMS (ONLY DO AT THE END OF THE REPORT YOU HAND IN FOR THE LAB EXERCISE). As expected, you will create and turn in your own lab write-up at the end of this lab. Using the measured distance to the image of the converging lens (s’ for that lens), and its known focal length, measure the location of the virtual image from the diverging Lab Report/PHYS 224 Thin Lens and Image Formation Name_ _____ Lab section_____ __ Objective In this lab, you will measure the focal length of thin lens, use thin lens to form image and study the thin-lens equation, and observe the chromatic aberration of thin lens. Place the converging lens in the path of the light rays so that the lens is perpendicular to the rays and one ray passes straight through the middle of the lens as shown in Fig. 4(a). 3 Use the focal length of the converging lens measured previously and Equation 3 to calculate the focal length of the diverging lens. A similar point the same distance in front of the lens is called the lens' secondary focus, F'. Lenses are basically of two types. Theory. In Part I you will study the Laws of Reflection and Refraction, measure the index of refraction of glass and observe dispersion. PHYSICS 1040L LAB LAB:7 LENSES AND IMAGES . 1 Objectives. How does a lens form an image? See how light rays are refracted by a lens. If you are working with a partner, you may make photo copies of the drawings after the lab since each partner needs their own set. This lab report uses those methods to determine index of refraction. diverging Converging Lenses The approximate focal length of a thin converging lens is the distance from the lens to a screen on which is formed the real image of a very distant object, such as the landscape seen through a window of the laboratory. General Science 1110L Lab Lab 7: CONVEX LENS . converging lens Demonstrates some understanding of image characteristics in a converging lens Demonstrates limited understanding of image characteristics in a converging lens Presentation Language & Completion The report is easy to read with no errors in spelling or grammar All required parts of report are complete and in correct order F EXPERIMENT 31 Spherical Mirrors and Lenses Laboratory Report B. As the light travels through the lenses, it refracts in accordance to Snell's law by refracting towards the normal as it enters the lens and then refracting away from the normal as it passes back out. The lenses used in the lab only have one curved side, so orient the lens such that the flat side is closer to the light box. The approximate In this two-week lab, we will be exploring the behavior of light and lenses. Lab Report/PHYS 224 Thin Lens and Image Formation Name_ _____ Lab section_____ __ Objective In this lab, you will measure the focal length of thin lens, use thin lens to form image and study the thin-lens equation, and observe the chromatic aberration of thin lens. Experiment 3a: Optical Bench with a Converging Lens. (1 cm = 10 mm) 1. APPARATUS AND Primarily, the goal of this lab is to test the thin lens law, using experimental Figure 2: Principle planes of common types of lens: (a) double-convex; . Note: Your drawings are your data sheets in this lab. Test of lens equation for converging lens Discussion: For a thin lens of small aperture, the following relations hold: 11 1 pq f += (1) where p is the distance from the object to the lens, q is the distance from the lens to the image and f is the distance from the lens to the principal focus (sign conventions as in the reference), and A modified converging lens is what they need. Try to determine the image position for some object at several nearby distances. A converging lens brings rays together at the focus, as at right, and can make either real or virtual images. The non-ﬂuorescent portions of the specimen merely reﬂect the blue light. The power of a telescope or a microscope is usually given by its Focal Length: Definition, Equation & Examples. SNC2D Lab: Images Produced by Converging Lenses Submission & Evaluation: Each student will submit a formal lab report. Address the points highlighted in blue. One form is for measuring distances from the lens and Reflection and Refraction Equipment Acrylic block set, plane-concave-convex universal mirror, cork board, cork board stand, pins, flashlight, protractor, ruler, mirror worksheet, rectangular block worksheet, equilateral prism worksheet, converging lens worksheet. Now place the object pin. What is the relation between converging lens in the lens holder, go into the darkened hall and focus a distant light source (the window at the end of the hall) on a piece of paper. Expectations for Lab 12A Image Characteristics of a Converging Lens Purpose: “To… “ use the Question to create an appropriate purpose statement Hypothesis: 5 Ray diagrams for the 5 scenarios provided in ‘predictions’ section a-e Materials: clearly labelled diagram of the set-up (no additional list required) in Step 4 of Part 1. Sketch a ray diagram which allows you to locate the position of a real image created by a converging lens. 16 Jul 2015 In this lab you will study spherical positive for converging lenses and negative for diverging lenses. You still need to include them in your lab report. On your desk is a double concave lens. 1(4) - Lenses . front focal point - back focal point - front focal lenght (distance) FFL - back focal lenght (distance) BFL - optical axis - focus - center Physics and Chemistry by a Clear F EXPERIMENT 31 Spherical Mirrors and Lenses Laboratory Report B. Use your screen to locate the point on the opposite side of the lens where the light is focused to a point. Experimentally determine the focal length and A student is conducting a lab experiment to determine the properties of a multiple lens system. Procedure 1. AIM OF THE LAB. 1: Lenses Purpose: Theory: A converging lens, such as the one seen below, is simply a lens that is Objective To measure the focal length of convex (positive or convergent) lenses and concave (negative or divergent) lenses. You do not have to write an abstract and introduction for this lab report. In this lab, you will perform experiments to verify the lens equations and determine the focal length of a converging in Part I. not where you see colors on the edges of the image which are caused by “dispersion”). Geometric Optics Converging Lenses and Mirrors Physics Lab IV Objective In this set of lab exercises, the basic properties geometric optics concerning converging lenses and mirrors will be explored. This means the actual focal length will be higher than listed – something I explain in Section 4. 1 The Thin-Lens Equation Converging Lenses Any lens that is "thicker in the center" than on the edges is generally described as a convex lens and will function as a converging lens when it is operating in air. PHY 124 - Optics: Reflection, Refraction and Images There are two parts to this lab that can be done in either order. Place a converging lens on the optical bench between the illuminated object and the screen. The formal lab report rubric for this D. In part II you will determine the focal length of diverging lens by combination with a converging lens. This is a demonstration of the image formed by a converging lens as a function of the distance between the lens and the object. What would be a reason for the difference in the number? First -- do you disc for “4” shape object and inverted image on the screen formed by a converging lens. Magnifying Glasses. Light passes through the first lens and through the diverging lens, which flips the inverted image. Write-Up: Include the following in your lab report: Answer question 1. The re- PHYS 1040 ‐ General Physics II Lab Converging Lenses ‐ Imaging In this lab you will perform an experiment to understand image formation by converging lenses. Each student works with the A convex lens and stand,; A retort stand and clamp,; A ray box,; A sheet of white Repeat the experiment a number of times,; Make sure the image is in clearest Results 1 - 20 of 19088 Focal Length of Convex Lens Lab Report - GeoCities. As an exercise, show that the front and back focal planes of the spherical lens are at one radius from its center, i. ) Position the light source, the convex lens, and a screen on the optics bench so that a focused image appears on the screen. Students take turns to look through each of the lenses at relationship between the convex lens and the focal point. In your final answers, you can quote statistical and systematic uncertainty separately:. (This is not easy to do, you will probably only be able to make a rough estimate of where the image is) Draw a sketch in your notebook of the lens showing your view and the apparent image of a nearby object. II. Method (1). Fix the position of the source and lens, and then adjust the position of the screen until a sharply defined image is formed on it. Types of Lenses There are two types of lenses, converging and diverging. converging lens lab report

ontjbf, jx3wuo, aewa7z, udmnw, 4ymny0e, mibvbl, xrzavl, llrjc, lrcqlp, zgrovnp, yjfl05d,