When direct sunlight strikes falling rain, a rainbow is seen at a point directly opposite the Sun. A double rainbow occurs when some of the light entering the raindrop is refracted into its component colors, reflected off the back interior wall of the drop, and refracted again as it exits the drop. The dark area in between the two rainbows is called Alexander's band.
Image Courtesy of Carlye Calvin/University Corporation for Atmospheric Research

When direct sunlight strikes falling rain, a rainbow is seen at a point directly opposite the Sun. A double rainbow occurs when some of the light entering the raindrop is refracted into its component colors, reflected off the back interior wall of the drop, and refracted again as it exits the drop. The dark area in between the two rainbows is called Alexander's band.
Image Courtesy of Carlye Calvin/University Corporation for Atmospheric Research

When direct sunlight strikes falling rain, a rainbow is seen at a point directly opposite the Sun. A double rainbow occurs when some of the light entering the raindrop is refracted into its component colors, reflected off the back interior wall of the drop, and refracted again as it exits the drop. The dark area in between the two rainbows is called Alexander's band.
Image Courtesy of Carlye Calvin/University Corporation for Atmospheric Research

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