acceptance angle
n0 sin Q1= underroot of (n1^2 -n2^2)= NA , where n0 refractive index of air=1,
Q1 is acceptance angle
n1 is the refractive index of core
n2 is the refrective index of cladding
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The acceptance angle of an optical fiber is the maximum incidence angle of a light ray which can be used for injecting light into a fiber core or waveguide.
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