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Atmospheric Optics
"Light playing on water drops, dust or ice crystals in the atmosphere produces a host of visual spectacles rainbows, halos, glories, coronas and many more. ... Find out where to see them and how they form." The site includes images and information about light rays and shadows, optical effects created by water droplets, ice halos, and high atmosphere phenomena. From a retired physicist and expert in atmospheric optics.
http://www.atoptics.co.uk/
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