In the case of refraction of light in a rectangular glass slab, if $\text{i}$ is the angle of incidence and $\text{e}$ is the angle of emergence, then:

The correct option is A $\text{e}=\text{i}$
The angle of emergence should be equal to the angle of incidence, for a smooth refraction in a rectangular glass slab. The angle of emergence is the angle formed by a light ray that emerges from the second surface of slab as a line parallel to the incident ray, with the normal. The angle of incidence is the angle which the incident light ray makes with the normal to the surface at the point of incidence.