Question

The speed of light in vacuum is 3 x 108 m/s and the refractive index of a medium with respect to vacuum is 1.5. Find the speed of light in that medium.

Answer 1

The Correct Answer is Option 4 i.e 2 × 108 m/s. The Refractive index of a medium is defined as the ratio of the speed of light in a vacuum to the speed of light in the medium. Refractive index (n)= c/v, where c is the velocity of light in a vacuum ( 3 × 108 m/s) and v is the velocity of light in a substance.

Vacuum: 1

Glass: 1.5