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    Question

    What is the power of a lens whose focal length is 1

    m?
    A 1D Correct Answer Incorrect Answer
    B 2D Correct Answer Incorrect Answer
    C 3D Correct Answer Incorrect Answer
    D 4D Correct Answer Incorrect Answer

    Solution

    Focal length: The lens power is the inverse of the focal length in meters. The physical unit for lens power is 1/meter which is called dioptre (D). Given: Focal length = 1 m Power = ? Power = 1/focal length (focal length = 1m) Power = 1D

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