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Q.4. The angle of a prism is A. One of its refracting surface is silvered. Light rays falling at an angle of incidence 2 A on the first surface returns back through the same path after suffering reflection at the silvered surface. The refractive index $\mu $ of the prism is:

(1) 2 sin A

(2) 2 cos A

(3) $\frac{1}{2}\mathrm{cos}A$

(4) tan A

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