Question

Light enters from air to glass plate with refraction index 1.5. Calculate the speed of light in glass

Answer 1

Since speed of light in air (C) = 3x10^8m/s

Refractive index = 1.5

Speed of light in glass (V) = ?

Since, refractive index = C/V

=> 1.5 = 3x10^8/V

=>V = 3x10^8/1.5=2x10^8m/s

Therefore the speed of light in glass is 2x10^m/s