If light travels at the same speed in all media, then in what terms is it slowed down or sped up in refraction?
In: Physics
Things slow down when stuff is in their way. Like running through water is slower than running through air. Usain Bolt could probably run even faster in a vacuum, except for that pesky problem of needing oxygen to breathe (and an oxygen tank might outweigh the benefits of getting rid of drag by removing the air).
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