Q. 214.8( 16 Votes )

Why does a light ray incident on a rectangular glass slab immersed in any medium emerges parallel to itself? Explain using a diagram.

Answer :

When light rays is incident on the rectangular glass slab immersed in any medium , then it is refracted by the glass slab and after refracting it comes out of the glass and gets another interface of glass and air, so on going from denser to rarer, it bends away from the normal ray. As the glass slab is rectangular in shape and both sides have the same medium. So, the light ray which is incident and the emergent rays are parallel. It can be shown with the help of following diagram:



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