Question

why does a ray of light passing through a glass slab do not show dispersion?

Answer 1

because a glass slab acts as a double presim the scattered light by one presim is cancelled by the another because of which the Dispersion of light cannot be observed

Answer 2

Answer:

The dispersion occurs in prism but not in glass slab because of the geometric design. Thus, the difference in a prism and glass slab is that, emerging colors from the second interface are not parallel to each other instead they are diverging, so after a certain distance we see the spectrum with separated.

Explanation: