A 110 −mm−mm -focal-length lens is used to focus an image on the sensor of a camera. The maximum distance allowed between the lens and the sensor plane is 142 mmmm .
How far ahead of the sensor should the lens be if the object to be photographed is 3.0 mm away?
How far ahead of the sensor should the lens be if the object to be photographed is 1.1 mm away?
What is the closest object this lens could photograph sharply?
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