Question

Why does light does not dispersion passes through a glass slab?

Answer 1

At the interface, it is bent in one direction if the material it enters is denser (when light slows down) and in the OTHER direction if the material is less dense (when light speeds up). ... Because white light is made up of ALL visible wavelengths, its colors can be separated (dispersed) by this difference in behavior.

Answer 2

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.

Explanation:

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.