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    Question

    What is the unit of measurement for optical power of the

    lens?
    A Yotta Correct Answer Incorrect Answer
    B Katal Correct Answer Incorrect Answer
    C Radian Correct Answer Incorrect Answer
    D Diopter Correct Answer Incorrect Answer

    Solution

    The unit of measurement for the optical power of a lens is the dioptre (also spelled diopter, symbol: D or dpt). One dioptre is equal to the reciprocal of the focal length measured in meters. 

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