If the speed of light in medium-1 is 2 x 108 m/s, then the speed of light in medium-2 whose relative refractive index w.r.t. medium-1 is 3, is (Consider c is speed of light in vacuum)

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$R e f r a c t i v e i n d e x o f m e d i u m 1 w i t h r e s p e c t t o v a c c u m = \frac{c}{S p e e d o f l i g h t i n m e d i u m 1} R e f r a c t i v e i n d e x o f m e d i u m 2 w i t h r e s p e c t t o v a c c u m = \frac{c}{S p e e d o f l i g h t i n m e d i u m 2} R e f r a c t i v e i n d e x o f m e d i u m 2 w . r . t . t o m e d i u m 1 = \frac{S p e e d o f l i g h t i n m e d i u m 1}{S p e e d o f l i g h t i n m e d i u m 2} 3 = \frac{S p e e d o f l i g h t i n m e d i u m 1}{S p e e d o f l i g h t i n m e d i u m 2} S p e e d o f l i g h t i n m e d i u m 1 = 2 \times 10^{8} m / s 3 = \frac{2 \times 10^{8} m / s}{S p e e d o f l i g h t i n m e d i u m 2} S p e e d o f l i g h t i n m e d i u m 2 = \frac{2 \times 10^{8} m / s}{3} = 0.66 \times 10^{8} m / s$
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