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mikael mikael
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9 years ago
In a 35 mm single lens reflex camera (SLR) the distance from the lens to the film is varied in order to focus on objects at varying distances. Over what range must a lens of  40 mm focal length vary if the camera is to be able to focus on objects ranging in distance from infinity down to  1.1 m from the camera? 
A) 1.51 mm 
B) 1.21 mm 
C) 4.53 mm 
D) 6.04 mm 
E) 2.11 mm 
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