The speed of light in air is 3 xx 10^(8)...

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)`

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