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Question
Light passes through a rectangular glass slab and through a triangular glass prism. In what way does the direction of the two emergent beams differ and why?
Solution
In case of a rectangular glass slab, emergent rays of light are always parallel to the direction of incident rays.
When a light ray passes through a prism, it bends towards the base of the prism. Hence, incident ray and emergent ray are not parallel to each other as they are in case of a glass slab.
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