Question

light enters from air to glass having refractive index 1.50 what is the speed of light in the glass the speed of light in vacuum is 3 into 10 to the power 8 m s to the power -1

Answer 1

Refractive index of glass = speed of light in vacuum / speed of light in glass

So, 1.50 = 3 × 10^8 / speed of light in glass

Speed of light in glass = 3 × 10^8 /1.50

Speed of light in glass = 2 × 10^8 m/s

Answer 2

Answer:

Refractive index of a medium (nm) = Speed of light in vacuum/Speed of light in the medium

Speed of light in vacuum (c) = 3 × 108 m/s

Refractive index of glass (ng) = 1.50

Speed of light in the glass (v) = Speed of light in vacuum/ Refractive index of glass

= c/ng

=3 × 108/1.50 = 2x 108 ms-1.