Double Rainbow Over Kaunas, Lithuania
September 17, 2009
secondary bow is known as Alexander's dark band and is an area nearly devoid of light rays. Direct sunlight doesn't reach this region of the sky; the dark band is illuminated only by scattered light from the surfaces of raindrops. Note that the colors are reversed for the two bows since the secondary bow (top) is the result of a second reflection inside each raindrop.