retroreflective element
smallest optical unit of a retroreflecting surface or device which, by refraction or reflection or both, produces a retroreflection
Note 1 to entry: This entry was numbered 17-1105 in CIE S 017:2011.
retroreflective element
smallest optical unit of a retroreflecting surface or device which, by refraction or reflection or both, produces a retroreflection
Note 1 to entry: This entry was numbered 17-1105 in CIE S 017:2011.