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A 86 mm focal-length lens is used to focus an image on the film of a camera. The maximum distance allowed between the lens and the film plane is 120 mm. How far ahead of the film should the lens (a) 12.0 m away mm (b) 3.7 m away mm (c) 1.7 m away mm (d) What is the closest object this lens could photograph sharply? cms be if the object to be photographed is at the following distance from the lens?

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