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NEET 2017 · Prism, Dispersion & Scattering

Prism, Dispersion & Scattering question from NEET 2017

Q77NEET 2017Medium

Prism, Dispersion & Scattering

A thin prism having refracting angle 10° is made of glass of refractive infex 1.42. This prism is combined with another thin prism of glass of refractive index 1.7. This combination producess dispersion without deviation. The refracting angle of second prism should be

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Answer: (a)

No deviation: $(\mu_1 - 1)A_1 = (\mu_2 - 1)A_2$ .
$0.42 \times 10^\circ = 0.7 \times A_2$
$A_2 = 6^\circ$
So the answer is (a) $6^\circ$ .

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