Question

How does angle of minimum deviation vary if the incident violet light is replaced by red like light?

Answer 1

Refractive index is inversely proportional to the wavelength of the light. As red has a higher wavelength than violet light therefore it has a smaller refractive index than violet.

Answer 2

Answer:

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.