Noisy Wave Pattern Between Round Objects Behind a Light

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SUMMARY

The discussion centers on the observation of a distinct black noisy waveform appearing between two small rounded quartz stones when illuminated from behind. This phenomenon is identified as a diffraction effect, similar to what can be observed in the gaps between fingers. The user highlights that viewing the stones from a distance enhances the effect, and references a hyper physics link that illustrates illumination patterns across a slit, noting that the irregular spacing between the stones results in a more complex image compared to parallel lines.

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Jarvis323
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I noticed that if I hold two small rounded quartz stones together in front of my eye, with light shining on them from the other direction, I see what looks like a very distinct, black, noisy waveform between them. Does anyone know the detsals about wy this happens?
 
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This sounds like a diffraction effect. You can get the same result in the gaps between the knuckles of your fingers. The trick is to look in there distance and not directly at your fingers. That gives a better effect. This hyper physics link gives an image of the illumination across the slit. With a slit, this will actually appear as a set of parallel lines. For two balls, the spacing varies so the lines will not be parallel and the image is more complicated.
 
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