Acceptance angle
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In optical fibers the acceptance angle θ is the half-angle of the cone within which incident light is totally internally reflected by the fiber core. It is equal to arcsin(NA), where NA is the numerical aperture of the fiber.
<math>\theta = \arcsin ({\rm NA}).<math>
Acceptance angle of a fiber is the maximum angle the ray may make with the axis and still propagate down the fiber by total internal reflection. (by CR)