I took this picture when boating a few months ago in Miami, Fl. It was a beautiful morning, right after a perfect storm. Double rainbows are rare but have scientific explanation. The University Corporation for Atmospheric Research gives the following explanation:
"The rainbow we normally see is called the primary rainbow and is produced by one internal reflection; the secondary rainbow arises from two internal reflections and the rays exit the drop at an angle of 50 degrees° rather than the 42°degrees for the red primary bow. Blue light emerges at an even larger angle of 53 degrees°."
Note that the colors of the two rainbows are reversed. Amazing!
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