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NEET 1989 (AIPMT) · Prism, Dispersion & Scattering

Prism, Dispersion & Scattering question from NEET 1989 (AIPMT)

Q96NEET 1989 · AIPMTEasy

Prism, Dispersion & Scattering

A ray of light is incident at an angle of incidence $i$ , on one face of a prism of angle $A$ (assumed to be small) and emerges normally from the opposite face. If the refractive index of the prism is $\mu$ , the angle of incidence $i$ , is nearly equal to

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Answer: (a)

Emerges normally, so $r_2 = 0$ and $r_1 = A$ .
Small angles: $\sin i = \mu \sin r_1 \Rightarrow i \approx \mu A$
So the answer is (a) $\mu A$ .

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