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?

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Solution

The correct option is A
When the angle of prism is small, then the angle of deviation is given by,

$D_{m} = (μ - 1) A$

According to the given graph, $μ$ decreases with the increase in the wavelength of incident light, and hence $D_{m}$ also decreases with the increase in the wavelength.

Hence, option $(A)$ is correct.

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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?

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?