Question

Why dispersion takes place in prism but not in glass slab?

Answer 1

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. ... In a triangular prism, the dispersion of the beam within the glass prism occurs.
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Answer 2

Answer:

Explanation:

Prism has 3 flat faces and a glass slab has 2 flat faces

In glass slab refaction takes place twice , whereas in prism refraction takes place thrice .

therefore , dispersion takes place in prism but not in glass slab