Question

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

Answer 1

For a given prism the refractive index is more for the violet ray of light than it is for the red ray of light ie the violet ray of light is deviated more than the red ray of light. If the incident violet light is replaced by red ray of light, the angle of minimum deviation decreses from its earlier value.

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Answer 2

Refractive index of the prism is inversely proportional to the wavelength of the incident light. Hence relative refractive index between prism and red light is less than the relative refractive index between the prism and violet light. ... Therefore the angle of minimum deviation for red light is less than the violet.