Question

What is the cause of such dispersion of white light?​

Answer 1

The reason for dispersion of light is that different lights have different frequencies and wave lengths , thus their speed in different medium differs, as a result dispersion takes place.

Answer 2

What is the cause of dispersion of white light as it passes through a prism? Answer: Dispersion occurs because the refraction of different colors is different. ... Hence the refractive index of the medium is largest for the violet colour and least for the red colour.