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Spectrogon US - Optical Filters 2024 LB
Photonics Dictionary

opposition effect

Also referred to as the opposition surge, the opposition effect is a photometric phenomenon in which a rough retroreflective surface appears brighter when illuminated from directly behind the observer in the retroreflected direction. This effect has been defined as the ratio of the retroflection at 0 degrees to the reflection at the 30 degrees scattering angle.
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