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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. Refractive index of the material of prism is

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An Intiative by Sri Chaitanya

a

2 sin A

b

2 cos A

c

1/2 cos A

d

tan A

answer is B.

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Detailed Solution

A=r+0 and μ=sin isin r⇒μ=sin2Asin A=2sinAcosAsin A=2cosA

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