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Velocity of light in air is 3 xx 10^8 "m s"^(-1) and of that in a given medium is 1.875 xx 10^8 "m s"^(-1) . Find the refractive index of the given medium.

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The speed of light in air is 3 xx 10^(8) m/s. IN medium X its speed is 2 xx 10^(8) m/s and in medium Y the speed of light is 2.5 xx 10^(8) m/s. Calculate: a) ._("air")n_(X) b) ._(x)n_(y)