Fresnel, Augustin Jean Fresnel
(noun) French physicist who invented polarized light and invented the Fresnel lens (1788-1827)
Source: WordNet® 3.1
fresnel (plural fresnels)
(physics) A unit of frequency equal to 1012 hertz, or one terahertz.
A Fresnel lens or a light feature using such a lens
• Fleners, flenser
Source: Wiktionary
14 April 2025
(noun) maximum clarity or distinctness of an image rendered by an optical system; “in focus”; “out of focus”
Decaffeinated coffee is not caffeine-free. Studies from the National Institute of Health (US) have shown that virtually all decaf coffee types contain caffeine. A 236-ml (8-oz) cup of decaf coffee contains up to 7 mg of caffeine, whereas a regular cup provided 70-140 mg.