Q.

A step index fibre has a relative refractive index of 0.88%. What is the critical angle at the corecladding interface?

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a

600

b

750

c

450

d

84°

answer is D.

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Detailed Solution

Here n1-n2n1=0.88100⇒n2n1=0.9912∴Critical angle ,θc=sin-1n2n1=sin-1(0.9912)=84024'
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A step index fibre has a relative refractive index of 0.88%. What is the critical angle at the corecladding interface?