The speed of light in vacuum is approximately:

If the speed of light in carbon disulfide and vacuum is X and Y respectively, then

The time taken to reach the Sunlight up to the surface of earth is approximately –

If the speed of light in air is 3 x 10⁸ m/s, then the speed of light in a medium of refractive index 2 is

Velocity of light is maximum in –

The nature of radiation of light is-