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Question


A student does the experiment on tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. He can get a correct measure of the angle of incidence and the angle of emergence by following the labelling indicated in figure:



(1) A
(2) B
(3) C
(4) D

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Solution

The angle formed by the incident ray and the normal to the rectangular slab is taken as the angle of incidence and the angle formed by the emergent ray and the normal is taken as the angle of emergence. According to this, the only figure showing the correct angle of incidence and emergence is figure D.

Hence, the correct answer is option 4.


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