Question

The diaphragm in a photographic camera controls:

• A. amount of light entering in the camera.
• B. the subject to be photographed
• C. both (a) and (b)
• D. none of these

Answer 1

Answer: (A)

amount of light entering in the camera.

Answer is A.

The size of the diaphragm opening in a camera lens regulates the amount of light passes through onto the film inside the camera, the moment when the shutter curtain in camera opens during an exposure process.
Hence, option A is correct.