Sylvanshine

Sylvanshine is an optical phenomenon in which dew-covered, wax-coated foliage retroreflects light, such as a vehicle headlight beam, sometimes making trees appear snow-covered at night in summer. It was named and explained in 1994 by Alistair Fraser of Pennsylvania State University, an expert in meteorological optics, who attributed the effect to the epicuticular wax on leaves causing water to form beads that act as lenses; these lenses focus incoming light to a spot on the leaf surface, and the image of that spot is reflected back as rays toward its source. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/