What is the difference between the displacement produced by a rectangular glass slab in a ray of light and the deviation produced by a glass prism

Difference between the displacement produced by a glass slab and the deviation produced by a glass prism is:

A glass slab causes apparent shift in the position of the because of refraction. The incident and the emergent rays are parallel but are displaced due to refraction causing apparent displacement of an object seen through a glass slab.

Deviation produced by a prism is due to the geometrical construction of the prism. Since the refracting sides are not parallel the deviations produced are more noticeable and also causes dispersion of light.