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Consider the situation as shown in figur...

Consider the situation as shown in figure. The point O is the centre. The light ray forms an angle of `60^@` with the horizontal and each mirror makes an angle `60^@` with the normal. The value of refractive index of that spherical portion so that light ray retraces its path is

A

`sqrt2`

B

`2/sqrt3`

C

`3/2`

D

`sqrt3`

Text Solution

Verified by Experts

The correct Answer is:
D

`mu=sin 60^@/sin 30^@=sqrt3`
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