newton rings

Newton's rings

noun Optics.
the pattern of light interference produced by the contact of the convex surface of a lens with a plane glass plate, appearing as a series of concentric, alternately bright and dark rings, which are colored if the light source is white.

1825–35; after I. Newton, who discovered them Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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