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MHT CET 2023 (13 May, Shift 1) · Prism, Dispersion & Scattering

Prism, Dispersion & Scattering question from MHT CET 2023 (13 May, Shift 1)

Q44MHT CET 2023 · 13 MAY · SHIFT 1Medium

Prism, Dispersion & Scattering

A ray of light is incident at an angle of incidence ' $i$ ' on one surface of a prism of small angle $A$ and emerges normally from the other surface. If the refractive index of the material of the prism is ' $\mu$ ', then the angle of incidence is equal to

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Answer: (c)

Normal emergence: $r_2 = 0$ , so $r_1 = A - r_2 = A$ .
Snell's law at the first face: $\sin i = \mu \sin A$ ; for small angles $i = \mu A$ .
So the answer is (c) $A\mu$ .

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