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A prism causes dispersion of white light...

A prism causes dispersion of white light while a rectangular glass block does not. Explain.

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1) In a prism the refraction of light at the two plane surfaces.
2) The dispersion of white light occurs at the first surface of prism where its constituent colours are deviated through different angles.
3) At the second surface, these split colours suffer only refraction and they get futher separated.
4) But in a rectangular glass block, the refraction of light takes place at the two parallel surfaces.
5) At the first surfaces, the white light splits into its constituents colours on refractions, but they split colours on suffering refraction at the second surface emerge out in the form of a parallel beam, which give an imperssion of white light.
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