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​ For students P, Q, R and S traced the path of a ray of light passing through a glass slab for an angle of incidence 40° and measured the angle of

refraction. The values as measured them were 18°; 22°; 25° and 30° respectively. The student who has performed the experiment methodically is (A) P (B) Q (C) R (D) S


The answer is (B) Q.
Because angle of refraction is taken as approximately half of angle of incidence.
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