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fermat principle
Fermat's principle
^{}
noun
Optics.
the law that the path taken by a ray of light in going from one point to another point
will
be the path that requires the least time.
Origin:
1885–90;
named after P. de
Fermat
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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fermat principle
Collins
World English Dictionary
Fermat's principle
—
n
physics
the principle that a ray of light passes from one point to another in such a way that the time taken is a minimum
Collins English Dictionary  Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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