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A type of surface accuracy specification that applies to curved optical surfaces. It is tested by comparing a curved surface against a reference surface with a highly calibrated radius of curvature. Using the same principle of interference caused by the air gaps between the two surfaces, the interferences pattern of fringes is used to describe the deviation of the test surface from the reference surface. A deviation from the reference piece will create a series of rings, known as Newton’s Rings.

See also Irregularity , Interferometry , Optical Flat , Interference Fringe

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