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Laser speckle is such a neat thing. If you've ever used a laser pointer, you've seen it: a kind of glittery quality in the spot of light it creates.

What's happening is, when coherent light from a laser pointer hits a surface with asperities larger than a wavelength, they interfere with one another, making some parts brighter than others.

en.wikipedia.org/wiki/Speckle_

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