principal plane

noun Optics.

a plane that is perpendicular to the axis of a lens, mirror, or other optical system and at which rays diverging from a focal point are deviated parallel to the axis or at which rays parallel to the axis are deviated to converge to a focal point.

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“Compliment” and “complement” had a shared meaning a long time ago, but today they are no longer interchangeable.

True

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Words nearby principal plane

principal ideal, principal ideal domain, principal nursing officer, principal optic axis, principal parts, principal plane, principal point, principal quantum number, principal rafter, principal value, principalities