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Fermat's Principle to explain lenses and mirrors

  1. Sep 11, 2015 #1
    How do we use Fermat's principle of least time to explain the required shapes of lenses and mirrors?
     
    Last edited: Sep 11, 2015
  2. jcsd
  3. Sep 11, 2015 #2

    robphy

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    Here's Feynman's explanation [see 57m15s]
     
  4. Sep 11, 2015 #3
    How about using fermat's principle for mirrors ?
     
  5. Sep 11, 2015 #4

    robphy

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    [see 27m05s]
     
  6. Sep 11, 2015 #5
    Hmm okay, thank you for the video,,
     
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