Light enters from air into a glass plate having refractive index `1.50`. What is the speed of light in glass? The speed of light in vaccum is `3 xx 10^(8) m s^(-1)`.

Explanation

Refractive index of a medium nm is given by,
`n_m=("Speed of light in vacuum")/("Speed of light in the medium")=c/v`
Speed of light in vacuum,
`c=3xx10^8 ms^(-1)`
Refractive index of glass,
`n_(g)` = 1.50
Speed of light in the glass,
`v=(c)/(n_g)=(3×x10^8)/(1.50) = 2xx10^8 m s^(-1)`