PHY110A ClevelandCC Lab 10 Convex & Concave Lenses Assignment

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read the istructions page and then using the simulation(linked) complete the second page

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PHY 110A–85 – Lab 10: Convex and Concave Lenses This lab uses an interactive figure at www.physicsclassroom.com . Introduction Lenses are found everywhere, from our eyes to the cell phone cameras we use daily. They come in two main types. A convex, or converging lens, is the type found in a common magnifying glass. A concave, or diverging, lens is just the opposite, with the center thinner than the edges. Both types of lenses bend – or “refract” – light passing through the lens. Because the light is bent at different angles at different points of curvature, the lens can form an image that is useful to us. In this lab, we use an interactive figure that will show us a lens, an object in front of (i.e. to the left of) the lens, and the image formed by the lens. We will see how three principal rays of light, reflected by the object, come together to form an image. One goal of this lab is to describe the image formed. A real image is formed where light rays come together. A virtual image is formed when light rays appear to come from the same point. Several conventions associated with the thin lens equation are used to describe objects and images. The object will always be to the left of the lens, and the object distance is positive. The image distance is positive to the right of the lens and negative to the left of the lens. Object and image heights are positive above the optical axis and negative below the optical axis. Procedure 1. Go to the “Optics Bench” interactive figure at http://goo.gl/iN0zfm . You can expand this to full-screen mode by clicking on the double arrow in the upper left corner of the figure. You can exit from full-screen mode by pressing the ESC key at any time. 2. On the top menu bar, make sure LENS and “Converging” are selected. 3. At the bottom of the screen, make sure rays 1, 2, and 3 are on. 4. Use the default focal length of 20 cm and the default object height of 10 cm. 5. Incrementally, place the object at distances of 70 cm, 50 cm, 30 cm, and 10 cm to the right of the lens. 6. With the object at each distance, record the image distance (cm), height (cm), orientation (upright or inverted), and type (real or virtual) in Table 1 below. 7. What happens to the image when the object is moved inside the focal point “f” (that is, it is located between the focal point and the lens)? Object Distance 70 cm 50 cm 30 cm 10 cm Distance Table 1: Converging Lens Image Height Orientation Type 8. Change the lens to “Diverging” and repeat steps 4 and 5 above. Record your results in Table 2 below. 9. Where is the image always located? Is it real or virtual? Is it upright or inverted? 10. Will a concave lens ever form a real image? Object Distance 70 cm 50 cm 30 cm 10 cm Distance Table 2: Diverging Lens Image Height Orientation Type 11. Use the information obtained to complete your lab report using the template provided. Save your completed document using the “lastname-lab09” file name convention to this course. Upload your completed assignment to Blackboard. Name: Date: Lab 10 – Lenses State table entries for distance and height in cm; you do not need to state units. State orientation as upright or inverted. State type as real or virtual. Object Distance 70 cm 50 cm 30 cm 10 cm Distance 28.2 Table 1: Converging Lens Image Height Orientation -3.9 Type Q1. What happens to the image when the object is moved inside the focal point “f” and is located between the focal point and the lens? Answer: Object Distance 70 cm 50 cm 30 cm 10 cm Distance Table 2: Diverging Lens Image Height Orientation Type Q2. Where is the image always located? Is it real or virtual? Is it upright or inverted? Answer: Q3. Will a concave lens ever form a real image? Answer: ...
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madushan
School: Boston College

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