2-1-005 Alternative terms: Visible Radiation (G.B.), Visible Radiant Energy (U.S.A.)
Any radiation capable of causing a visual sensation directly.
Note: The limits of the spectral range of visible radiation are not well-defined and may vary according to the user. The lower limit is generally taken between 380 and 400 nm and the upper limit between 760 and 780 nm.
1 nanometre (nm) = 10-9m = 1 millimicron.
Reference: C.I.E. (modified)
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
centre of gravity
Centre of buoyancy
Celsius (previously Centigrade)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM