Light passes through a rectangular glass slab and through a triangular glass prism. Using proper ray diagram, explain in what way does the direction of the two emergent beams differs with respect to the incident beam of light.
Ray diagram of Light passing through rectangular glass prism is given below
Light emerges from the glass slab in direction parallel with that in which it enters the glass slab. Perpendicular distance between incident ray and emergent ray coming out of glass salb is called lateral displacement.
Ray diagram of Light passing through triangular glass prism:
The incident ray PQ refracts towards the normal at surface AB of prism and then refracts again away from normal through surface AC. The emergent ray RS is not parallel to the incident ray as in case of rectangular glass slab.