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Thread: Why does light slow down in water?

  1. #1 Why does light slow down in water? 
    KJW
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    https://www.youtube.com/watch?v=CUjt36SD3h8

    This YouTube video gives two wrong answers (which it explains are wrong) and the correct answer.

    One of the wrong answers, the absorption-emission answer, is so commonly given that I felt the need to post this thread.


    There are no paradoxes in relativity, just people's misunderstandings of it.
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  3. #2  
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    Refraction?


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  4. #3  
    exchemist
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    Quote Originally Posted by KJW View Post
    https://www.youtube.com/watch?v=CUjt36SD3h8

    This YouTube video gives two wrong answers (which it explains are wrong) and the correct answer.

    One of the wrong answers, the absorption-emission answer, is so commonly given that I felt the need to post this thread.
    A nice explanation that avoids the pitfalls of the common pseudo-explanations. He doesn't get into the phase/signal/group velocity stuff of course, but as its aimed as a young audience that's fair enough.
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  5. #4  
    exchemist
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    Quote Originally Posted by mathman View Post
    Refraction?
    That is explained by the change in phase velocity, yes.
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