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Proof of Fermat's principle of least time?

  1. Aug 16, 2014 #1
    I've been looking for this proof for months but I wasn't able to find something...
     
  2. jcsd
  3. Aug 17, 2014 #2

    Simon Bridge

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    It is not something that you prove. It is (part of) a Law of Nature.
    You can derive it from Huygen's principle, and it follows from the Variation principle in classical mechanics.
     
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