1.

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`

Answer» Correct Answer - 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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