Homework Help: physics

Posted by rick on Monday, March 24, 2008 at 9:37pm.

From a distance of 60 m, a photographer uses a telephoto lens (f = 300.0 mm) to take a picture of a charging rhinoceros. How far from the rhinoceros would the photographer have to be to record an image of the same size using a lens whose focal length is 45.0 mm?

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