Question

Define focal length. Upon what factor does the amount of light entering in a camera depend?

Answer 1

Answer:

The amount of light entering into the camera depends upon the size of aperture. Aperture is an opening in the diaphragm behind the lens.

Explanation:

Answer 2

Answer:

focal length = R/2

Explanation:

depends upon Apperture setting of a camera hope u understood then mark brainlist