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  4. 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 Dm is the angle of minimum deviation?

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Q. 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?Physics Question Image

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Solution:

Since $D_m = (\mu - 1)A$
& on increasing the wavelength, $\mu$ decreases & hence $D_m$ decreases.