Fresnel (unit)

A fresnel is a unit of frequency equal to one trillion cycles per second (i.e., 1012 s−1). It was occasionally used in the field of spectroscopy, but its use has been superseded by terahertz (with the identical value 1012 hertz). It is named for Augustin-Jean Fresnel the physicist whose expertise in optics led to the creation of Fresnel lenses.

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