reflectance (for incident radiation of given spectral composition, polarization and geometrical distribution) [ρ]

ratio of the reflected radiant flux or luminous flux to the incident flux in the given conditions

Unit: 1

NOTE Reflectance, ρ, is the sum of regular reflectance, ρr, and diffuse reflectance, ρd: ρ = ρr + ρd.

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