3 ms·
> light moves at a constant speed While in the same medium, right? The speed of light is a universal constant in a vacuum, like the vacuum of space. However,
by adolph 3y ago
> light moves at a constant speed
While in the same medium, right?
The speed of light is a universal constant in a vacuum, like the vacuum of space. However, light can* slow down slightly when it passes through an absorbing medium, like water (225,000 kilometers per second = 140,000 miles per second) or glass (200,000 kilometers per second = 124,000 miles per second).*
https://www.space.com/15830-light-speed.html#section-speed-of-light-faqs-answered-by-an-expert https://www.space.com/15830-light-speed.html#section-speed-o...
- lxgr 3y agoLight propagation in a medium is a quite different thing from light in vacuum. For example, the speed of light in a medium is not the "speed limit" of things in the same medium, and particles in it can actually move faster than light: https://en.wikipedia.org/wiki/Cherenkov_radiation https://en.wikipedia.org/wiki/Cherenkov_radiation In other words, the speed of light in vacuum plays a special role in both a vacuum and a medium.