A double rainbow is a secondary rainbow. 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°. his effect produces a secondary rainbow that has its colors reversed compared to the primary.
The secondary rainbow is about 10° further out from the antisolar point than the pimary bow, is about twice as wide, and has its colors reversed.
The light of the secondary bow is one-tenth the intensity of that of the primary bow, given the same viewing conditions.
What Makes Up the Colors of the Rainbow?
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