Question

The absolute refractive index of glass and water are 4/3 and 3/2 respectively if the speed of light in glass is 2*10 8m/s then determine the speed of light in vaccum

Answer 1

ng=4/3.also ng = c/v. therefore c/v=4/3. then by cross multiplication c =4×2×10^8/3.then c = 2.67×10^8.