In discussing geometrical optics, Fermat's principle of least time is often used to solve problems and is generally used as a replacement of laws of reflection and refraction. Fermat's principle is usually presented as an intuitive idea, but I wish to find a way where we can show that is is actually a result of least of reflection and refraction. We have explanation for laws of reflection and refraction and they must be the basic laws, with Fermat's principle being a consequence of it. Do we have any explanation suggesting that Fermat's principle is the direct consequence of laws of reflection and refraction?


marked as duplicate by Qmechanic Aug 25 at 10:24

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