The velocities of light in glass and water medium of the refractive index 3/2 and 4/3 respectively are

Options

A. `1 xx 10^(8) m//s, 3.25 xx 10^(8) m//s`
B. `2 xx 10^(8) m//s, 2.25 xx 10^(8) m//s`
C. `3 xx 10^(8) m//s, 1.25 xx 10^(8) m//s`
D. `3 xx 10^(8) m//s, 3.25 xx 10^(8) m//s`

Answer

B

Explanation

`v_(g) = (v_(a))/(mu_(g)) = (3 xx 10^(8))/(1.5) = 2 xx 10^(8) m//s`
`v_(w) = (v_(a))/(mu_(w)) = (3 xx 10^(8))/(4//3) = 2.25 xx 10^(8) m//s`