Tuesday, June 16, 2015

Cataract Journey Side Note: Lunar Haloes

Over on APOD, I see this beautiful image:

And its description: Rings like this will sometimes appear when the Moon is seen through thin clouds. The effect is created by the quantum mechanical diffraction of light around individual, similarly-sized water droplets in an intervening but mostly-transparent cloud. Since light of different colors has different wavelengths, each color diffracts differently. Lunar Coronae are one of the few quantum mechanical color effects that can be easily seen with the unaided eye.

And I am so relieved that this is a real phenomenon, and not further proof that I need cataract surgery. I don't see multiple colored rings, but a soft halo the same color as the object (white, in the case of the Moon).

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