if photons have the same speed in all reference frames according to GR, why do slomo films of light beams exist?
In: Physics
I’m not familiar with these films, but light travels at different speeds depending on the medium it’s traveling through. Light travels fastest (aka the “speed of light”) only in a vacuum (like in space.) but in air in travels a little slower, in water a little slower still, etc. And it travels the slowest through solids like glass or plastic. So, if you send a beam of light through a very dense but transparent solid it would travel slow enough to see it propagate.
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