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

The speed of light in vacuum 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

If the speed of light in air is represented by c and the speed in a medium is v, then the refractive index of the medium can be calculated using the formula

The refractive index of crown glass is close to 3/2. If the speed of light in air is c, then the speed of light in the crown glass will be close to

The phenomenon of light bending around an obstacle is called: