Extra Final Exam Practice Problems-solutions - huynh(lth436...

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huynh (lth436) – Extra Final Exam Practice Problems – erickson – (59005) 1 This print-out should have 93 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0points An object is placed near a plane mirror, as shown. mirror surface Object E G D M A Which of the labeled points is the position of the image? 1. M 2. G 3. A correct 4. E 5. D Correct answer: 1 . 20252 m. 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 image. 002 10.0points If you take a photograph of your image in a plane mirror, how many meters away should you set your focus if you are 2 . 5 m in front of the mirror? Correct answer: 5 m. Explanation: Set your focus for 5 m; your image will be as far behind the mirror as you are in front. 003(part1of2)10.0points A concave mirror has a radius of curvature of 1 . 6 m. Calculate the position of the image pro- duced when an object is placed 2 . 39 m from the mirror.
Explanation: The line connecting the object and its im- age should be perpendicular to the plane of the mirror, and the perpendicular distance from the image to the mirror is the same as the perpendicular distance from the object to mirror. mirror surface Eye Object E G D M Image θ θ θ Clearly only point A is the position of the Let : p = 2 . 39 m and R = 1 . 6 m . For concave mirror, f = R 2 = 0 . 8 m 1 p + 1 q = 1 f . 1 q = 1 f 1 p = 1 0 . 8 m 1 2 . 39 m = 0 . 83159 m 1 q = 1 . 20252 m . 004(part2of2)10.0points
huynh (lth436) – Extra Final Exam Practice Problems – erickson – (59005) 2 Calculate the position of the image when an object is placed 0 . 464 m from the mirror. real, upright, smaller 005(part1of3)10.0points A concave shaving mirror has a focal length of 40 cm. a) Calculate the image position of a cologne bottle placed in front of the mirror at a dis- tance of 98 cm. (Answer with 1000 if the image does not exist.) 1 q = 1 f 1 p q = parenleftbigg 1 f 1 p parenrightbigg 1 = parenleftbigg 1 40 cm 1 98 cm parenrightbigg 1 = 67 . 5862 cm . 006(part2of3)10.0points b) Calculate the magnification of the image. (Answer with 1000 if the image does not exist.) c) Describe the image. 1. real, upright, smaller
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