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A comment on Schlieren Optics – See small changes in the index of refraction in air. Parent comment

Re:Schlieren Optics – See small changes in the index of refr... by amritamaz on Sunday November 23, 2014 @01:49PM (#8649495)
I think they are aberrations in the mirror's glass. People used to use Schlieren optics-esque techniques to test glass for defects.
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