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NEET 2020 (Phase 1) · Prism, Dispersion & Scattering

Prism, Dispersion & Scattering question from NEET 2020 (Phase 1)

Q67NEET 2020 · PHASE 1Easy

Prism, Dispersion & Scattering

A ray is incident at an angle of incidence i on one surface of a small angle prism (with angle of prism A) and emerges normally from the opposite surface. If the refractive index of the material of the prism is $\mu$ , then the angle of incidence is nearly equal to:

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Answer: (b)

Emerges normally, so $r_2 = 0$ and $r_1 = A - r_2 = A$ .
Snell's law at the first face, small angles: $i \approx \mu r_1$ .
$i \approx \mu A$
So the answer is (b) $\mu A$ .

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