Equi-Angular Profile

From International Dictionary of Marine Aids to Navigation
Jump to navigation Jump to search


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