Focal Plane (of a lens or focusing reflector)

From International Dictionary of Marine Aids to Navigation
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2-2-165

The plane normal to the optical axis of the lens or reflector and containing the focus.

Ch2 Fig10.jpg




Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM