How does the angle of minimum deviation of a glass prism vary, if the incident violet light is replaced with red light?
Wavelength of red light is greater than that of violet light. And, refractive index of any light is inversely proportional to the wavelength. Therefore, refractive index of red light is less. In turn, angle of minimum deviation has a linear dependance with refractive index.
Thus, when violet light is replaced with red light, angle of minimu deviation decreases.
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