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What does the thin lens formalism say about the focal length of a thin lens? Write down expressions for the focal length of a thin

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What does the thin lens formalism say about the focal length of a thin lens? Write down expressions for the focal length of a thin lens in air expressed in terms of the powers of the two surfaces: Ans: in terms of the curvatures of the two surfaces: Ans: and in terms of the radii of curvature of the two surfaces: Ans

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