Four students showed the following traces of the path of a ray of light passing through a rectangular glass slab. The trace most likely to be correct is that of student:

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III

answer is C.

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Detailed Solution

Concept: Refraction of light - phenomenon of incident ray light bends when passes through one medium to another.
1- As first when a ray of light incident on a glass slab - ray of light is incident ray and angle which make outside glass slab is angle of incidence.
2- when the ray of light enter inside the glass slab it got refracted or we can say the it bends from its angle of incidence - ray of light inside the glass slab is refracted ray and angle which the glass slab and refracted ray make is angle of refraction .
3- when the refracted ray comes out of the glass slab , the incident ray and refracted ray are parallel to each other.
4- In figure I ,II and IV the incident ray and refracted ray are not parallel to each other.

Hence, the correct option is 3.

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