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Unformatted text preview: aljabr (faa335) Hw22 Ross (89251) 1 This print-out should have 13 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 2) 10.0 points An object is p = 48 cm in front of a concave mirror. Its real image height is 6 times larger than the object height. p h What is the location of the image? Correct answer: 288 cm. Explanation: 1 p + 1 q = 1 f = 2 R m = h h =- q p Concave Mirror f > >p> f f <q < >m>- f >p>- <q < >m> 1 Let : M =- 6 and p = 48 cm . Let the location of the image be denoted as q . q p h h' f R Since the image is 6 times larger than the object, and is a real image, as stated in the problem ( p > 0 and q > 0), the magnification must be negative; i.e. , M =- 6. M = h h =- q p =- 6 , so q =- M p =- (- 6) (48 cm) = 288 cm . 002 (part 2 of 2) 10.0 points What is the radius of curvature of the mirror? Correct answer: 82 . 2857 cm. Explanation: Now that we have q and p , we can find the radius of the curvature via the relationship 1 p + 1 q = 2 R or R = 2 pq p + q = 2 (48 cm) (288 cm) 48 cm + 288 cm = 82 . 2857 cm . 003 10.0 points A concave mirror has a focal length of 51 . 9 cm. Determine the object position for which the resulting image is upright and four times the size of the object. Correct answer: 38 . 925 cm....
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This note was uploaded on 01/27/2011 for the course PHYS 251 taught by Professor Gavrine during the Spring '10 term at Purdue University-West Lafayette.
- Spring '10