The refractive index of water is frac(4)...

The refractive index of water is `frac(4)(3)` and speed of light in air is `3xx10^8m//s.` Find the speed of light in water

`2.67 xx 10^(8)` m/s

`2.25xx 10^(8)` m/s

`1.78 xx 10^(8)` m/s

`1.50 xx 10^(8)` m/s

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