Fermat's Principle to explain lenses and mirrors

isnainidiah
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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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on Phys.org
Here's Feynman's explanation [see 57m15s]
 
How about using fermat's principle for mirrors ?
 
[see 27m05s]
 
Hmm okay, thank you for the video,,
 

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