Question

what is meant by dispersion when will it take place

Answer 1

splitting of white light into seven colours called vibgyor , it occurs when the white light passes through the prism or water bubble .its common example is rainbow

Answer 2

dispersion is the phenomena of splitting of white light into its constituent colours.It happens due to different velocity due to different wavelength of each colours.dispersion can be observed when light passes through prism. Or formation of rainbow is also an example of dispersion.