Optics
Numerical Aperture
The numerical aperture characterizes the light-gathering ability and resolution of an optical system, particularly microscope objectives.
Variables
NAunitless
Numerical aperture
nunitless
Refractive index of medium
\theta°
Half-angle of maximum cone of light
Derivation
Related to the cone of light that can enter or exit the optical system. Higher NA means better resolution and light-gathering capability.
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