Question

6. Light enters from air to glass having refractive
index 1.50. What is the speed of light in glass? The
speed of light in vacuum is 3x10 power 8m/s *​

Answer 1

speed of light in glass (v) = c (speed in vaccum)/n (refractive index of material)

v = 3×10^8/1.50

v = 2×10^8m/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.