Question

Which of the following symbols is a measure of the light-gathering qualities of the lens

and a constant value for each lens?
A) d
B) λ
C) n sin α
D) n sin α and N. A.
E) N. A.

Answer 1

Numerical Aperture (NA) is a measure of the light-gathering qualities of a lens and is a constant value for each lens. It is calculated using the formula NA = n sin α, where n is the refractive index of the medium and α is half the acceptance angle for light rays. NA is important in microscopy as it relates to the lens's ability to gather light and resolve finer details.

Step-by-step explanation:

The measure of the light-gathering qualities of a lens and a constant value for each lens is called Numerical Aperture (NA). NA is calculated using the formula NA = n sin α, where n is the refractive index of the medium between the lens and the object, and α is half the acceptance angle for light rays. NA is important in microscopy as it determines the lens's ability to gather light and resolve finer details.