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Newton's rings

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plural noun Optics.
  1. 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.
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Origin of Newton's rings

1825–35; after I. Newton, who discovered them
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018