Find the velocity of light in water, if its velocity in glass of refractive index 1.5 is `2 xx 10^(8)m//s`. The refractive index of water is 1.33.

Explanation

Refractive index of water, `n = 1. 33`
`v _(w) = 2. 3 xx 10 ^(8) ms ^(-1)`
We have `n= ( c)/( v _(w)) = 3.0 59 xx 10 ^(8) ms ^(-1)`