The variation of refractive index of a crown glass thin prism with wavelength of the incident light is shown. Which of the following graphs is the correct one, if D_{m} is the angle of minimum deviation?

(a) |
(b) |
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(c) |
(d) |

The variation of refractive index of a crown glass thin prism with wavelength of the incident light is shown. Which of the following graphs is the correct one, if D_{m} is the angle of minimum deviation?

(a) |
(b) |
||

(c) |
(d) |

1 Answer - 5876 Votes

3537

Since D_{m}=(μ−1)A & on increasing the wavelength, μ decreases & hence D_{m} decreases.

Therefore correct answer is (b)