First slide
Ray optics
Question

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

Moderate
Solution

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

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