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NEET 2014 (AIPMT) · Prism, Dispersion & Scattering

Prism, Dispersion & Scattering question from NEET 2014 (AIPMT)

Q82NEET 2014 · AIPMTMedium

Prism, Dispersion & Scattering

The angle of a prism is A. One of its refracting surfaces 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

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Answer: (b)

Retracing needs normal incidence on the silvered face: $r_2 = 0 \Rightarrow r_1 = A$ .
$\sin 2A = \mu\sin A \Rightarrow \mu = 2\cos A$
So the answer is (b) $2\cos A$ .

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