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Hi there,
dispersion of light is the scattering of light into its constituent  particles.

the color white consist of 7 colours (vibgyor)
when light  passes through a prism the light get scattered thus differentiating the colours.
i hope this helps u..
the process of splitting up of white light into many colours is called dispersion.the band of colours produced when white light is split up is called a spectrum.a spectrum is formed when white light passes through a prism.a rainbow is an example of it.

hope it helps...