Question

what are the causes of dispersion of light

Answer 1

Dispersion of White Light By a Prism. Refraction is the bending in the path of the light when it travels from one medium to the another. The degree at which refraction will occur depends on the wavelength of the light. ... Prism only acts as a medium for the dispersion of light made of the seven colors.

Answer 2

the different coloured components of light have different speed therefore they deviate by different angles on passing through a glass prism hence it appears that the bend with different angles and this is called the reason why Dispersion of light takes place