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Four students P, Q, R and S traced the path of a ray of light passing through a rectangular glass slab for an angle of incidence of 45° and measured the

corresponding angle of emergence. The values of angle of emergence obtained by them were 42°, 46°, 48°, 55° respectively. The experiment was correctly performed by (A) P and Q (B) Q and R (C) only S (D) only Q


The refractive index Is not given
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