A type of surface accuracy specification that describes how the shape of a surface deviates from the shape of a reference surface. Regularity refers to the sphericity of the circular fringes that are formed from the comparison of the test surface to the reference surface. When the power of a surface is more than 5 fringes, it is difficult to detect small irregularities of less than 1 fringe. So surfaces are specified with a ratio of power to irregularity of approximately 5:1.
See also Power , Interferometry , Optical Flat , Interference Fringe
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