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Old Sep 25th 2011, 04:31 AM   #1
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Simple lens problem

Hi, would really really appreciate if you could help this newbie out with a high school physics question. Here it is (its lens and optics)

Bill with a height of 1.8m standing at a distance of 4m away from a camera. If the camera has a lens with a power of + 4.0 D, what is the height of Bill's image on the film?

Help is much appreciated dearest kind souls thanks !
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Old Sep 25th 2011, 09:49 PM   #2
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magnification = size of the image/size of the object = f/(u - f),
where f is the focal length = 1/D and u is the object distance.
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Old Sep 26th 2011, 01:45 AM   #3
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thank you kind soul , got the answer
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