2. A camera has a single converging lens with a fixed focal length f (a) How far

Question

2. A camera has a single converging lens with a fixed focal length f (a) How far should the lens be from the film in order to focus an object that is infinitely far away (namely the incoming light rays are parallel with the principal axis of the system (b) How far should the lens be from the film to focus an object at a distance of 2f in front of the lens? (c) What is the magnification of the image in part (b)? (d) Is the image in part b real or virtual? (e) Is the image in part (b) inverted (f) If the camera can focus on objects at infinity and the lens can only move a distance f/2, what is the minimum distance at which an object can be focused? aperture ring shutter speed control lens film shutter diaphragm focusing ring

Explanation / Answer

a) focal length,f

b)2f.

c)magnification=- image distance/object distance

                                    =-(2f/-2f)=1

d) real image as it is formed on opposite side of lens

e)image is inverted(all real images are inverted for converging lens)

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