Question

Light enters from air to glass having refractive index1.5 what is the speed of light in glass speed of light in vaccum is 3×10^8 m/s

Answer 1

Refractive index =Speed of light in vacuum/speed of light in any other medium

1.5=3*10^8/speed of light in glass

speed of light in glass =3 * (10^8) / 1.5=   2  *  10^ 8m/s