Reciprocal length or inverse length is a measurement used in several branches of science and mathematics. As the reciprocal of length, common units used for this measurement include the reciprocal metre or inverse metre (\(m^{-1}\)), the reciprocal centimetre or inverse centimetre (\(cm^{-1}\)), and, in optics, the dioptre. (http://qudt.org/schema/qudt/LatexString)