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Draksis314
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Why does refraction occur? I know that it's because light travels at different speeds in different mediums, but I don't see how that would cause a light wave to bend. I found "the wave must continuous across a boundary, which requires that the phase of the wave be constant on any given plane" at http://scienceworld.wolfram.com/physics/SnellsLaw.html" , but I don't really understand what that means.
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