Refractive index of glass with respect t...

Refractive index of glass with respect to medium is `(4)/(3)`. If `v_(m) - v_(g) = 6.25 xx 10^(7)` m/s., then velocity of light in medium is

`2.5xx10^8"m s"^(-1)`

`0.125xx10^8"m s"^(-1)`

`1.5xx10^8"m s"^(-1)`

`3xx10^8"m s"^(-1)`

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