Question

light enters from having refractive index 1.50 calculate the speed of light in glass

Answer 1

Refractive index = speed of light in vacuum
————————————
speed of light in medium
1.50 = 3 x 10(8)
——————-
Speed of light in any medium


Speed of light in any medium = 3 x 10(8)
—————-
1.5

Speed of light in any medium = 2 x 10(8)

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.