The refractive indices of water and diamond are `(4)/(3)` and 2.42 respectively. Find the speed of light in water and diamond.
`(c=3xx10^(8)m//s)`

Explanation

Given, `mu_(w)=(4)/(3), mu_(d)=2.42, c=3xx10^(8)m//s`
Velocity of light in water
`v_(w)=(c )/(mu_(w))`
`=(3xx10^(8))/(4//3)`
`=(3xx3)/(4)xx10^(8)`
`=(9)/(4)xx10^(8)`
`v_(w)=2.25xx10^(8)m//s`
Similarly, `v_(d)=(c )/(mu_(d))`
`=(3xx10^(8))/(2.42)`
`=1.24xx10^(8)m//s`