As a vacuum is devoid of such particles, light can attain its maximum velocity, which, as far as we know, cannot be surpassed. However, light travels at about 0.75c (75% light speed) through water. Some charged particles can move faster than 0.75c in water and therefore travel faster than light.

Can you make light go faster?

Nothing can move faster than the speed of light. ... The speed of light, according to Einstein, was the same for all observers in all reference frames, and no form of matter could ever attain it.

Can light go faster than itself?

When vacuum energy is lowered, light itself has been predicted to go faster than the standard value c. This is known as the Scharnhorst effect. Such a vacuum can be produced by bringing two perfectly smooth metal plates together at near atomic diameter spacing. It is called a Casimir vacuum.