Quote:
Originally posted by shakran
That is also untrue. It has been proven that light does slow down (not very much, mind you) when passing through media of varying density. i.e. it slows down when passing into water. it then speeds up when/if it exits the water again.
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Ahh but light itself does not actually slow down no? It merely seems to to the person measureing it from point A to point B because the light is bouncing back and forth between molecules of air, water or whatever, the light itself never actually goes any slower even though it appears to. I think its somthing along the lines of the speed of light in a vaccum is 3x10^8 m/s and thats that. It's technically always travelling in a vaccum since it is "small enough" (not that we can actually equate a 'size' to light') to "squeeze" between the molecules, but it still bounces off them, hence it actually travels a farther distance than we would measure, making it appear to move slower when in fact it is still going at 3x10^8.
I think?
[edit] I see KnifeMissle has said essentially the same thing earlier in this thread, as he has just said. My apologies...[/edit]