A ray of light is incident at an angle i on one face of prism of small angle A and emerges normally from the other surface. μ is the refractive index of the material of the prism. The angle of incidence is (a) A/2μ (b) Aμ (c) A/μ (d) Aμ/2

Answer: (b). Normal emergence: r₂ = 0, so r₁ = A. sin i = μsin A; small angles give i = μ A. So the answer is (b) Aμ.

A ray of light is incident at an angle i on one face of prism of… | MHT CET 2020 (16 Oct, Shift 1)

Q70MHT CET 2020 · 16 OCT · SHIFT 1Medium

Prism, Dispersion & Scattering

A ray of light is incident at an angle $i$ on one face of prism of small angle $A$ and emerges normally from the other surface. $\mu$ is the refractive index of the material of the prism. The angle of incidence is

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Answer: (b)

Normal emergence: $r_2 = 0$ , so $r_1 = A$ .
$\sin i = \mu\sin A$ ; small angles give $i = \mu A$ .
So the answer is (b) $A\mu$ .

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Prism, Dispersion & Scattering question from MHT CET 2020 (16 Oct, Shift 1)

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