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solution_pdf2 - McPartlin(anm464 assignment 9...

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McPartlin (anm464) – assignment 9 – frommhold – (58025) 1 This print-out should have 6 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 16.66 points Assume that a camera has a fixed focal length of 57 . 9 mm and is adjusted to properly focus the image of a distant object. How far must the lens be moved to focus the image of object that is 2 . 95 m away? Correct answer: 1 . 15916 mm. Explanation: Given : p 2 = 2 . 95 m and f = 57 . 9 mm . To focus on a very distant object, the original distance from the lens to the film was q 1 = f = 57 . 9 mm. To focus on an object 2 . 95 m away, the thin lens equation gives 1 f = 1 p 2 + 1 q 2 1 q 2 = 1 f - 1 p 2 = p 2 - f fp 2 q 2 = p 2 f p 2 - f = (2950 mm) (57 . 9 mm) 2950 mm - 57 . 9 mm = 59 . 0592 mm Thus, the lens should be moved farther from the film by the distance Δ q = q 2 - q 1 = 59 . 0592 mm - 57 . 9 mm = 1 . 15916 mm . 002 16.66 points Find the change in the focal length of the eye when an object originally at 4 m is brought to 24 cm from the eye.
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