Question

speed of light in air is 3 into 10 raise to the power 8 cm M per second and speed of light in glass is equal to 2 into 10 raise to the power 8 metre per second find the refractive index of glass

Answer 1

Refractive index of a medium = Speed of light in vacuum/Speed of light in a medium

1.5 = 3 x 108 / Speed of light in medium

Speed of light in the medium = 3 x 108/1.5
                                                  = 2 x 108m/s.