When parallel rays of light enter a prism, the light is deviated towards:

When parallel rays of light enter a prism, they are deviated towards the base of the prism. This occurs due to the refraction of light as it passes from one medium to another (from air to glass). The prism is typically shaped with two angled surfaces, and when light enters the first surface, it bends towards the normal line because glass is denser than air. As it exits through the second surface, it bends away from the normal line. The result of these two refractions is that the light rays are redirected downward towards the base of the prism.

This bending effect creates a certain angle of deviation, which is influenced by the refractive index of the prism material and the angle at which the light enters. Thus, the rays that were initially parallel become diverged and are directed towards the base of the prism as a result of this refraction process. The understanding of light behavior in prisms is fundamental in optics, demonstrating the principles of refraction and how light interacts with different materials.