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A sept index fibre has a relavitive refr...

A sept index fibre has a relavitive refractive index of `0.88%`. What is the critical angle at the core-cladding interface?

A

`60^(@)`

B

`75^(@)`

C

`45^(@)`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
d
Here `(n_(1)-n_(2))/(n_(1))=(0.88)/(100)implies(n_(2))/(n_(1))=0.9912`
`:.` Critical angle
`theta_(c)=sin^(-1)((n_(2))/(n_(1)))=sin^(-1)(0.9912)=84^(@)24'`
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