Question

draw course of ray (i) a glass slab (ii) a glass prism. why net deviation through a glass slab is zero. but net deviation through glass prism is not zero?​

Answer 1

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 colours 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

Answer 2

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 colours 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