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Q.

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

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a

2

b

4

c

8

d

0

answer is A.

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Detailed Solution

$\begin{array}{l} \frac{Sin θ}{Sin θ / 2} = \frac{θ}{θ / 2} = μ \\ ∴ μ = 2 \end{array}$

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