| Definition: | quotient of the regularly reflected part of the (whole) reflected flux and the incident flux Note 1 to entry: Reflectance, ρ, is the sum of regular reflectance, ρr, and diffuse reflectance, ρd: ρ = ρr + ρd. Note 2 to entry: The regular reflectance has unit one. Note 3 to entry: This entry was numbered 845-04-60 in IEC 60050-845:1987.
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