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Angle of prism is A and its one surface ...

Angle of prism is `A` and its one surface is silvered. Light rays falling at an angle of incidence `2 A` on first surface return back through the same path after suffering reflection at second silvered surface. Refraction index of the material of prism is

A

`2 sin A`

B

`2 cos A`

C

`(1)/(2) cos A`

D

`tan A`

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The correct Answer is:
b
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