The Best Why Is The Speed Of Light A Neat Integer 2023. How fast does light move? Web the only thing that affects the speed of light is the refractive index of the medium through which it moves, and for empty space, this number is 1.000000 and gives you the maximum possible speed of light.

The answer to this is related to the fact that the speed of light in vacuum, c, is an upper bound to all possible locally measured speeds of any object. The light bulb gives off light in all directions and the light travelling from one side of the light bulb has the opposite velocity of the light traveling from the other. And why does it matter?