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Name the person, who formed “The Principle of least time“?

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Name the person, who formed “The Principle of least time“?

(a) Pierre de Fermat

(b) C.V Raman

(c) John Kepler

(d) Albert Abraham Michelson

This question was addressed to me by my school teacher while I was bunking the class.

This interesting question is from Dispersion, Fermat’s Principle & its Application topic in portion Optics of Engineering Physics II

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The correct answer is (a) Pierre de Fermat

For explanation: Fermat’s Principle or the principle of least time was named after French mathematician Pierre de Fermat.  This principle states that the path taken between two points is the path that can be traversed in the least time.

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