reflectance factor optical density
reflectance factor density
logarithm to base 10 of the reciprocal of the reflectance factor,
Note 1 to entry: The reflectance factor optical density has unit one.
Note 2 to entry: This entry was numbered 845-04-67 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-1060 in CIE S 017:2011.