Question

A silicon optical fibre with a core diameter large enough has a core refractive index of 1.50 and a cladding refractive index 1.47. Determine
(i) the critical angle at the core cladding interface,
(ii) the numerical aperture for the fibre
(iii) the acceptance angle in air for the fibre.

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Solution
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Here,

(i) Critical angle  at the core-cladding interface is given by
     
(ii) Numerical aperture,
       
(iii) Acceptance angle 

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