A photographer uses his camera whose lens has a 60mm focal
A photographer uses his camera, whose lens has a 60mm focal length, to focus on an object 2.5m away. He then wants to take a picture of an object that is 30 cm away. How far must the lens move to focus on this second object?
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A photographer uses his camera, whose lens has a 60mm focal length, to focus on an object 2.5m away. How far must the lens move to focus on this second object
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