Four students P, Q, R and S traced the path of a ray of light passing through a glass slab for an angle of incidence \[\mathbf{4}{{\mathbf{0}}^{\mathbf{o}}}\] and measured the angle of refraction. The values as measured them were \[\mathbf{1}{{\mathbf{8}}^{\mathbf{o}}}\mathbf{;}\,\mathbf{2}{{\mathbf{2}}^{\mathbf{o}}}\mathbf{;}\,\mathbf{2}{{\mathbf{5}}^{\mathbf{o}}}\] and \[\mathbf{3}{{\mathbf{0}}^{\mathbf{o}}}\] respectively. The student who has performed the experiment methodically is |
(a) P (b) Q |
(c) R (d) S |
Answer:
(c) R
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