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    Question

    An imaginary line passing through the center of the

    spherical mirror or the center of the lens or the center of curvature is called ______________.
    A Vertical axis Correct Answer Incorrect Answer
    B Pole Axle Correct Answer Incorrect Answer
    C Spherical Pivot Correct Answer Incorrect Answer
    D Main axis Correct Answer Incorrect Answer

    Solution

    The imaginary line passing through the center of a spherical mirror, the center of a lens, or the center of curvature is called the "principal axis. or main axis".

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