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Fermat's Principle - The Principle of Least Time asserts that light will always follow a path between two points that minimizes the time of traversal
Fermat's Principle The "Principle of Least Time" asserts that light will always follow a path between two points that minimizes the time of traversal between those points.Note that for straight rays, the time of traversal for light in medium with index n isI n where l is the length of the ray.a Use this principle to prove the Law of Reflection ; with the geometry shown.
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