The line passing through the optical centre and centres of curvature of the faces of a lens or a curved mirror. 2. any of three mutually perpendicular axes about which the moment of inertia of a body is maximum.
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The line passing through the optical centre and centres of curvature of the faces of a lens or a curved mirror. 2. any of three mutually perpendicular axes about which the moment of inertia of a body is maximum.