Physics Help Forum Simple lens problem

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 Sep 25th 2011, 03:31 AM #1 Junior Member   Join Date: Sep 2011 Posts: 2 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 !
 Sep 25th 2011, 08:49 PM #2 Senior Member   Join Date: Dec 2008 Location: Udupi, Karnataka, India Posts: 292 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.
 Sep 26th 2011, 12:45 AM #3 Junior Member   Join Date: Sep 2011 Posts: 2 thank you kind soul , got the answer

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