Fermat's principle

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Related to Fermat principle: Huygens principle

Fermat's principle

n
(General Physics) 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
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Nevertheless, Fermat principle is invariant under reparameterising, then parameter "arc length" l may be substituted by optical path, in such a way that dl = [n.
Fermat principle would lead to the already known solution: [[?