Define the term principal axis of a lens.

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Solution

Principal axis is the line joining the centers of curvature of the two surfaces of the lens.
A line passing through the center of the surface of a lens or spherical mirror and through the centers of curvature of all segments of the lens or mirror.

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Define the term principal axis of a lens.

Principal axis is the line joining the centers of curvature of the two surfaces of the lens.A line passing through the center of the surface of a lens or spherical mirror and through the centers of curvature of all segments of the lens or mirror.

Principal axis is the line joining the centers of curvature of the two surfaces of the lens.
A line passing through the center of the surface of a lens or spherical mirror and through the centers of curvature of all segments of the lens or mirror.