Question

A boy uses the blue colour of light to find the refractive index of glass. He then repeats the experiment using the red colour of light. Will the refractive index be the same or different in the two cases? Give a reason to support your answer.

Answer 1

The refractive index will be different in both cases.

Refractive index of glass is different for different colors. The speed of blue light is less than the speed of red light. So, the wavelength of blue light is less than that of red light. Thus, the red light would deviate less than blue light because of difference in wavelength.