Why does the direction of a mechanical wave change in refraction?
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Similar question answered here. – Sam Feb 17 '20 at 18:33
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4Does this answer your question? Why does light change direction when it travels through glass? – Sam Feb 17 '20 at 18:34
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Are you asking about a mechanical wave or a light wave (ray)? – sammy gerbil Feb 17 '20 at 19:39