Question

The refractive indices of four substances P, Q, R and S are 1.50, 1.36, 1.77 and 1.31 respectively. The speed of light is the maximum in the substance : (a) P (b) Q (c) R (d) S

Answer 1

$n=\frac{c}{v}$

$v=\frac{c}{n}$

so speed of light is the maximum in the substance in which refractive index is lowest i.e. S 1.31