Refractive index of glass is 1.5 and that of water is 1.3. If the speed of light in water is 2.25`xx10^8`m/s. What is the speed of light in glass?

Explanation

Here `n_g=1.5` and `n_w=1.3` let `v_1` and `v_2` be the speeds of light in glass and water respectively. If c is the speed of light in air then
`c//v_1=1.5` and `c//v_2=1.3` then, `V_1//v_2=1.3//1.5`
`v_1=1.3//1.5xx2.25xx10^8`
`v_1=1.95xx10^8m//s`
Speed of light in glass is `1.95xx10^8m//s`