Luminous ray

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(Luminous) Ray

Alternative term: (Light) Ray

The path followed by light, which may be represented either by a straight line in a homogeneous medium, or by a bent or curved line in a non-homogeneous medium.

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