Question

Light enters air to glass having an refractive imdex 1.50 what is the speed of light in the glass? The speed of light in vaccum is 3. 108 m/s

Answer 1

Speed of light (v)= refractive index/velocity of light=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.