A transparent cylinder has its right hal...

A transparent cylinder has its right half polished so as to act as a mirror. A paraxial light ray inciden from left, that is parallel to the principal to the incident ray as shown. The refractive index n of the material of the cylinder is

A

1.2

B

1.5

C

1.8

D

`2.0`

Text Solution

Verified by Experts

The correct Answer is:

D

For spherical surface
using `(n_(2))/v-(n_(1))/u=(n_(2)-n_(1))/R`
`rArr n/(2R)-1/(oo)=(n-1)/R`
`rArr n=2n-2`
`rArr n=2`

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