# 18) In an experiment for determination of refractive index of glass of a prism by i - $\delta$ plot, it was found that a ray incident at angle 35$°$, suffers a deviation of 40$°$ and that it emerges at angle 79$°$. In case that 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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