coefficient of retroreflection (of a plane retroreflecting surface) [RA]

quotient of the coefficient of luminous intensity, R, of a plane retroreflective surface by its area, A


Unit: cd⋅lx-1⋅m-2

NOTE 1 This quantity is particularly suitable for describing materials in sheet form.

NOTE 2 Formerly the symbol R' was used for this quantity.

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