Question

Why light dispersion seven colour only in prism why not in glass slab​

Answer 1

Answer:

The dispersion occurs in prism but not in glass slab because of the geometric design. In a slab, the opposite sides are parallel to each other whereas, in the case of the prism, the sides are not parallel to each other. ... They travel a very small distance in the glass slab to meet the second interface.

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Answer 2

Answer:

$\Huge\bold\blue{Answer}$

The dispersion occurs in prism but not in glass slab because of the geometric design. ... They travel a very small distance in the glass slab to meet the second interface. But, after being refracted through the second interface, all colours start moving parallel to each other which recombine together to give white light.