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HW #11-solutions

# HW #11-solutions - nanni(arn437 HW#11 Erskine(56905 This...

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nanni (arn437) – HW #11 – Erskine – (56905) 1 This print-out should have 18 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0points A concave mirror with a radius of curvature of 1.0 m is used to collect light from a distant star. What is the distance between the mirror and the image of the star? 1. d = 1 . 0 m 2. d = 0 . 75 m 3. d = 0 . 50 m correct 4. d = 0 . 25 m 5. d = 2 . 0 m Explanation: Let : R = 1 m . The focal length of the mirror is | f | = | R | 2 = 1 . 0 m 2 = 0 . 50 m . Light from a distance star is approximately parallel, so the image of the star is almost at the focal point. Thus the distance between the mirror and the image of the star is most nearly 0.50 m. 002(part1of9)10.0points For a concave mirror, when the object is placed farther from the mirror than the mir- ror’s focal length, but closer to the mirror than the mirror’s radius ( f < p < R ), the image is 1. same size as the object. 2. smaller than the object. 3. larger than the object. correct Explanation: 1 p + 1 q = 1 f = 2 R m = h h = - q p ConcaveMirror f > 0 >p>f f <q< 0 >m> -∞ f >p> 0 -∞ <q< 0 >m> 1 q p h h' f R 003(part2of9)10.0points For a concave mirror, when the object is placed farther from the mirror than the mir- ror’s focal length, but closer to the mirror than the mirror’s radius ( f < p < R ), the image is 1. inverted. correct 2. erect. 3. at infinity or undetermined. Explanation: From the ray diagram, the image is in- verted. 004(part3of9)10.0points For a concave mirror, when the object is placed farther from the mirror than the mir- ror’s focal length, but closer to the mirror than the mirror’s radius ( f < p < R ), the image is 1. behind the mirror.

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