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MHT CET 2020 (19 Oct, Shift 2) · Prism, Dispersion & Scattering

Prism, Dispersion & Scattering question from MHT CET 2020 (19 Oct, Shift 2)

Q69MHT CET 2020 · 19 OCT · SHIFT 2Medium

Prism, Dispersion & Scattering

A ray of light is incident at an angle $i$ on one face of a thin angled prism. The ray emerges normally from the other face. Refractive index of the glass prism is $n$ and angle of prism is $A$ . The value of $i$ is

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Answer: (a)

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

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