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CSE · Paper I · Waves & Opticscse-2020-subject-02-002

Fermat’s principle — UPSC Physics Optional CSE 2020 Paper I

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State and explain Fermat's principle of extremum path. Discuss the cases of rectilinear propagation of light and reversibility of light rays in context of Fermat's principle. Using Fermat's principle, deduce the thin lens formula.

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