While moving from a rarer to a denser medium, a light beam bends toward the normal while moving from a rarer to a denser media moves away from the normal.
Consider a glass slab that is rectangular and has parallel sides PQ and RS, as illustrated in the image below.

At point O, a light beam EF travelling through the air strikes the glass surface PQ. The ray EO bends toward normal and follows the path OO^l inside the glass slab as it transitions from air (a rarer media) to glass (a denser medium). When refraction from glass (a denser medium) to air (a rarer media) occurs at point O^l, the ray deviates from its regular course and travels along O^lH outside the glass slab. Here, the rays EF and OO^l are referred to as incident, refracted, and emergent, respectively.
The emerging ray O^lH will be parallel to the incident beam EF in accordance with the principles of refraction.

The term "lateral displacement" refers to the angle O^lI=x between the incident ray's original path and the emerging ray.