Light scattering causes the halo that appears on street lights. An regnerischen Tagen, the air is full of countless small water droplets, each of which is like a prism. The street light emits different wavelengths of light, and the refraction angles of light of different wavelengths (Farben) in small water droplets are different. The light spreads out as it passes through the small water droplets, and different colors of light are separated. Light refracts in these droplets and forms a halo around them.
Mehr Lektüre: Beleuchtung Einheitlichkeit des Straßenlichts: Wie man misst und verbessert
