Which of the following statements about the working principle behind a basic still camera is true?
a.
light entering the camera through a nonadjustable opening is focused on light-sensitive film at the back of the camera.
b. light entering the camera through a light-sensitive opening is focused on 35 mm film at the back of the camera.
c.
changeable lenses of different focal lengths allow light to enter the camera, which then forms the image on light-sensitive film.

C. Changeable lenses of different focal lengths allow light to enter the camera, which then forms the image on light-sensitive film.

Explanation:

A is not an option, as the opening is always adjustable. And B is also not an option opening is never light sensitive. And C seems to be correct as changeable lenses of the different focal lengths are the correct option, and it certainly allows light to enter the camera, which then forms the image on the light-sensitive film.

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