Evening rainbow with supernumeraries

This bright rainbow has a faint secondary bow outside the main one, and, more interestingly, some clearly visible supernumeraries. These are the purple-green bands just inside the main bow, and are an effect which cannot be explained by classical physics -- a wave theory of light is necessary to account for them.

You can see them more clearly in the zoomed-in shot below (some gamma adjustment has been done on these pictures to bring out the supernumaries). Note also the blotches, caused by poking the camera out of a window during a shower -- water drops on the lens is not a good idea.

Les Cowley's Atmospheric Optics site has a good section on supernumeraries. If you're very lucky, you may spot secondary supernumeraries, outside the secondary bow.

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