In an experiment for determination of refractive index of glass of a prism by i-8 plot, it was found that a ray incident at an angle 35° suffers a deviation of 40° and that it emerges at an angle 79°. In that case, which of the following is closest to the maximum possible value of the refractive index? (a) 1.5 (b) 1.6 (c) 1.7 (d) 1.8
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