AIPMT | 2014Geometrical OpticsHard

Question

The angle of a prism is A. One of its refracting surfaces is silvered. Light rays falling at an angle of incidence 2A on the first surface returns backthrough the same path after suffering reflection at the silvered surface. The refractive index μ, of the prism is

Options

A.2sin A
B.2 cos A
C.cos A
D.tan A

Solution

         
Normal incidence at silvered surface
∵ μ = so, μ so, μ = 2 cos A

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