reciprocal metre
SI coherent derived unit
| Name | Symbol | Derived quantity | ||
| reciprocal metre | m−1 | wave number |  |
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DefinitionThe reciprocal metre is the SI coherent derived unit of wavenumber. One reciprocal metre is equal to one divided by one metre. |
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The reciprocal metre is used in optics as a measure of the optical power of a lens or curved mirror.
Metric System 