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Calculate the numerical aperture, acceptance angle, and critical angle of a fiber having a core refractive index of 1.5 and a cladding refractive index of 1.45.
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Solution:

We know that the numerical aperture is,

Since,

NA=n21n22n1=1.5,n2=1.45NA=(1.5)21.45)2=0.38

Also, the acceptance angle α=sin1 NA

α=sin1(0.38)=22.8

The critical angle,

ϕc=sin1(n2n1)=sin1(1.451.5)=75.2

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