The Ability of a Lens to Gather Light is Referred

Question

The ability of a lens to gather light is referred to as its
A) resolution.
B) numerical aperture.
C) refraction.
D) contrast.
E) magnification.

Accepted Answer

Numerical aperture refers to the light-gathering ability of a lens. It is a measure of the cone of light that can enter the lens and reach the image plane, with higher numbers indicating a greater ability to collect more light.