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reciprocal length
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.
Quantities measured in reciprocal length include:
* absorption coefficient or attenuation coefficient, in materials science
* curvature of a line, in mathematics
* gain, in laser physics
* magnitude of vectors in reciprocal space, in crystallography
* more generally any spatial frequency e.g. in cycles per unit length
* optical power of a lens, in optics
* rotational constant of a rigid rotor, in quantum mechanics
* wavenumber, or magnitude of a wavevector, in spectroscopy
* density of a linear feature in hydrology and other fields; see kilometre per square kilometre
==Further reading==
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