The prism has refracting angle ' A '. The second refracting surface… | MHT CET 2023 (11 May, Shift 1)

Q46MHT CET 2023 · 11 MAY · SHIFT 1Medium

Prism, Dispersion & Scattering

The prism has refracting angle ' $A$ '. The second refracting surface of the prism is silvered. Light ray falling on first refracting surface with angle of incidence ' $2A$ ', reaches the second surface and returns back through the same path due to reflection at the silvered surface. The refractive index of the material of the prism is

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Answer: (d)

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 (d) $2\cos A$ .

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Prism, Dispersion & Scattering question from MHT CET 2023 (11 May, Shift 1)

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