camera uses single lens: image distance for object at infinity? please help!?

A

Aliiii :)

New member
A film camera uses a single lens with a focal length f = 58 cm.
(a) Calculate the image distance for an object at infinity. in cm
(b) Calculate the image distance for an object that is 2.7 m away. in cm
(c) How far must the lens be moved with respect to the film when an object moves from infinity to a point 2.1 m from the camera? in cm
 
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