Does light always travel at the speed of light?

Even in vacuum conditions, light can move slower than its maximum speed depending on the structure of its pulses. read more

Light doesn’t always travel at the speed of light. A new experiment has revealed that focusing or manipulating the structure of light pulses reduces their speed, even in vacuum conditions. read more

Light doesn’t always travel at the speed of light. A new experiment reveals that focusing or manipulating the structure of light pulses reduces their speed, even in vacuum conditions. read more

Light travels slower in a medium than it does in a vacuum, and the speed is proportional to the density of the medium. This speed variation causes light to bend at the interface of two media -- a phenomenon called refraction. read more