A photographer uses his camera whose lens has a 40mm focal
A photographer uses his camera, whose lens has a 40mm focal length, to focus on an object 5.0m away. He then wants to take a picture of an object that is 50cm 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 40mm focal length to focus on an object 50m away he then wants to take
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