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Change in the direction of propagation of a wave when its transmitting medium changes. The tag does also apply to index of refraction.

1 vote
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416 views

The speed of light/EM waves in vacuum; as if there was another one in non-vacuum?

Q1: is there a speed of a photon other than in "vacuum"? Q2: isn't "speed of light in vacuum" misleading? If I understand, that light moves with speed of light until there is "something in between" …
halfbit's user avatar
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