Fermat's principle

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.

1885–90; named after P. de Fermat

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Fermat's principle
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
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