fresnel

• Nom propre ou nom commun dérivé, se rapportant au physicien français Augustin Fresnel, célèbre pour ses travaux sur la lumière polarisée et pour l'invention de la lentille de Fresnel. Peut aussi désigner l'unité de fréquence équivalente au térahertz, utilisée en spectroscopie.

A proper noun referring to a French physicist known for his work on polarized light and the invention of the Fresnel lens.

indénombrable · nom propre

1. French physicistC2formalscientific

   Augustin-Jean Fresnel (1788-1827), a French civil engineer and physicist who made significant contributions to the theory of wave optics and invented the Fresnel lens.

   Augustin-Jean Fresnel

   • Fresnel's work on light diffraction laid the foundation for modern optics.
   • The Fresnel lens revolutionized lighthouse illumination in the 19th century.
   • Fresnel's theories on polarized light were groundbreaking for his time.

2. Fresnel lensC1formalscientific

   A type of compact lens originally developed by Augustin-Jean Fresnel for use in lighthouses, consisting of a series of concentric grooves that reduce the amount of material needed while maintaining the focusing power.

   lentille de Fresnel

   • The lighthouse was equipped with a powerful Fresnel lens.
   • Modern overhead projectors often use a Fresnel lens to focus light.
   • Fresnel lenses are also used in solar energy concentrators.