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Most of us have seen a single . Many of us have seen a double rainbow. But occasionally someone will spot a *split* rainbow. These can be produced if some of the raindrops are flattened or elongated, though it's not always clear what causes the change in shape.

This is an interesting set of photos of a *multiple-split* rainbow and and an article on trying to calculate the circumstances that produced it.

atoptics.wordpress.com/2019/06

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