fresnel

noun

1. a unit of frequency, equal to 1012 cycles per second.

noun

1. Augustin Jean,1788–1827, French physicist.

noun

1. a unit of frequency equivalent to 10 12 hertz

noun

1. Augustin Jean (oɡystɛ̃ ʒɑ̃). 1788–1827, French physicist: worked on the interference of light, contributing to the wave theory of light

1. French physicist whose investigations of the interference, diffraction, and polarization of light helped establish the theory that light moves in a wavelike motion. Fresnel also made great contributions to the field of optics, including the development of a compound lens for use in lighthouses.