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
A
I
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B
II
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C
III
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D
IV
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Solution
The correct option is C III Due to refraction of light inside the glass slab, the incident ray of light turns inwards of the slab and then again refracts at the other surface to obtain a beam of light parallel to the incident light. Clearly IV is rejected since the outgoing beam is not parallel to the incident.
Also options I and II are rejected since the bending of light is finite and inwards unlike in the given options respectively. Hence, the correct option is III.