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2.3: Principle of Fermat
https://phys.libretexts.org/Bookshelves/Optics/BSc_Optics_(Konijnenberg_Adam_and_Urbach)/02%3A_Geometrical_Optics/2.03%3A_Principle_of_Fermat
The starting point of the treatment of geometrical optics is the very powerful. Principle of Fermat (1657). The path followed by a light ray between two points is the one that takes the least amount ...The starting point of the treatment of geometrical optics is the very powerful. Principle of Fermat (1657). The path followed by a light ray between two points is the one that takes the least amount of time.

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