Question

light enters from air to glass having refractive index is 1.50 what is the speed of light in glass

Answer 1

1.50÷3*10^8m\second(speed of light)

Answer 2

we take speed of light in air as 3.0*10^8 m/s,

speed of light in air/ speed of light in glass=1.50/1

3.0*10^8/ speed of light in glass=1.5/1

by cross multiplication,
3.0*10^8/1.5= speed of light in glass

so we get that speed of light in glass=2.0*10^8 m/s