# How does the angle of minimum deviation of a glass prism vary if the incident violet light is replaced by red light?

$\delta_m=(\mu-1)A$

The refractive index of a prism is inversely proportional to the wavelength.

The wavelength of red light is more than that of violet light so the angle of minimum deviation of a glass prism decreases if the incident violet light is replaced by the red light.

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