Equi-Angular Profile

From International Dictionary of Marine Aids to Navigation
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2-2-145

A stepped profile such that a light ray emitted from the focus and passing through a portion of the profile exhibits equal angles of incidence and emergence. This produces minimum dispersion.

Ch2 Fig15.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