Tuesday, March 17, 2015

Supernumerary Rainbows

Sacramento received 0.2" of rain on March 11th - the only rain in more than a month in what is still nominally the rainy season.

There was a rainbow this evening with very pronounced supernumerary bows inside the main arch. Supernumerary bows are caused by light interference, but only when raindrop sizes are very-nearly uniform.

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