Fermat's Principle to explain lenses and mirrors

  • #1

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How do we use Fermat's principle of least time to explain the required shapes of lenses and mirrors?
 
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  • #2
robphy
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Here's Feynman's explanation [see 57m15s]
 
  • #3
How about using fermat's principle for mirrors ?
 
  • #4
robphy
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[see 27m05s]
 
  • #5
Hmm okay, thank you for the video,,
 

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