( Bob Henson, via UCAR Digital Image Library ) Rainbows result from the refraction and reflection of sunlight by these water droplets. For a rainbow to form, water droplets must be present in the air in front of an observer and the sun must be shining from behind the observer. ![]() ![]() ![]() Above: This rainbow appears unusually low in the sky because it has formed early in the afternoon, rather than toward sunset.
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