Question

(ntse exam question) Amount of light entering into the camera depends upon: (1) focal length of objective lens. (2) product of focal length & diameter of objective lens. (3) distance of objective from camera. (4) aperture setting of the camera.

Answer 1

 Amount of light entering into the camera depends upon:aperture setting of the camera.

Answer 2

The answer is, (4) aperture setting of the camera.   :).