QuizWk3Soln

QuizWk3Soln - so that the image on the wall is in focus? 1...

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Name _____________________________________ Section ___________ Physics 208: Week 3 Quiz Refraction and lenses 1. The index of refraction of a kind of glass is 1.5. What is the speed of light in the glass? (the speed of light in vacuum is 3x10 8 m/s). v glass = v vacuum / n glass = c / n glass = 3 " 10 8 m / s 1.5 = 2 " 10 8 m / s 2. A light beam in a medium with index n =1 is incident as shown on a medium with index n =1.5. Which drawing correctly shows the path of the transmitted light? 3. You hold an 0.2 m focal length lens 2 m away from a wall to project an image of your ipod’s screen on the wall. At what distance from the lens should you hold your ipod
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Unformatted text preview: so that the image on the wall is in focus? 1 s + 1 " s = 1 f : 1 s + 1 2 m = 1 0.2 m # 1 s = 4.5 m $ 1 = 9 2 m $ 1 . So the object distance is s = 2 9 m = 0.22 m 4. Suppose that in question 3 you found an object distance of 0.25 meters. How many times bigger is the image on the wall than the ipod screen? The magnification is " image distance object distance = " 2 m 0.25 m = " 8. So the image is eight times bigger than the object. The minus sign is consistent with it being inverted. 5. Use ray tracing to locate the image of the arrow produced by the lens Object image n =1 n =1.5 A. B. C. D....
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