A CDE Definition
(1) See numerical aperture.
(2) (Not Applicable) A commonly used abbreviation in the English language for entering nothing in a form or table field because no data are relevant to the situation.
The measurement of the acceptance angle of an optical fiber, which is the maximum angle at which the core of the fiber will take in light that will be contained within the core. Taken from the fiber core axis (center of core), the measurement is the square root of the squared refractive index of the core minus the squared refractive index of the cladding. See critical angle and fiber optics glossary.
The Acceptance Angle
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