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WeltevredenKaroo
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Reged: 03/05/12

Loc: 31°51'09" S 24°25'47" E
At last—diff rings to look for on cloudy days new
      #5659794 - 02/03/13 11:32 AM

This Optics Picture of the Day image has a good discussion of the Babinet Principle, which states that diffraction patterns formed by an opaque shape are essentially the same as those formed by a circular aperture such as a telescope lens. The article is accompanied by some marvelous images of Airy discs and Fraunhofer rings formed in the sky.

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Dave O
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Reged: 12/21/11

Loc: Sri Lanka
Re: At last—diff rings to look for on cloudy days [Re: WeltevredenKaroo]
      #5659826 - 02/03/13 11:50 AM

Wow -- and there are the colors someone was asking about in another thread a while back. Thanks for sharing.

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