A student does the experiment on tracing the path of a ray of light 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:
Class 10 Science Lab Manual Refraction Through Glass Slab Material
(a) A               (b) B                (c) C                  (d) D

Dear Student
The labelling of part d is correct.
Please see below figure for refraction of light through glass slab,



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Part D is correct mam
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