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Question

Find the refractive index of the core of an optical fiber if the critical angle is 60 and the refractive index of the cladding is 3?



Your Answer
A

2

Correct Answer
B

2

Your Answer
C

3

Your Answer
D

2.5


Solution

The correct option is B

2


We know that optical fibre works on the principle of Total Internal Reflection.

Applying Snell's law
sin θC=R.I of Rarer MediumR.I of Denser mediumsin 60=R.I of claddingR.Iofcore32=3nn=2
Hence, the correct option is 'B'.

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