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Unformatted text preview: Practice Problems for 7C Exam 2 November 1, 2009 Problem 1 A glass ball of radius r has an index of refraction of n g = 1 . 5. The back half of the ball is silvered so that it behaves as a convex (converging) mirror. Suppose an object is 4 r away from the center of the ball. a. Where does the image form? b. Find the magnification. c. Is the image upright or flipped? Problem 2 A light bulb of height 5 cm is placed 30 cm from a concave mirror as shown. The mirror has a focal length of 20 cm and is located to the left of the bulb. There is a converging lens of focal length 20 cm located 5 cm from the bulb to the right. The lens forms two images of the bulb, one from the light directly coming from the bulb and the other from the reflection of the bulb in the mirror. a. For each of the two images formed, draw a ray diagram that locates the image. Make sure the figures are legible. b. For each image, answer: What is the distance from the bulb to the image in cm?...
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- Fall '08