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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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