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A physicist.[ref]
https://www.fresnel.fr/wp/institut/presentation/augustin-fresnel/. Independent biographical identity and professional specialization
Portrait of Augustin-Jean Fresnel
. Pierre-Jean David d’Angers, sculptor; photograph by Eric Emo; Paris Musées / Musée Carnavalet, S668. Creative Commons CC0 1.0 Universal Public Domain Dedication, as supplied by Paris Musées. Source usage terms, via Wikimedia Commons. Source.
Augustin-Jean Fresnel (1788–1827) was a French engineer and physicist, best known for his work on the wave theory of light and the development of the Fresnel lens. His contributions significantly advanced our understanding of optics. Fresnel's most notable achievements include: 1. **Wave Theory of Light**: Fresnel was a prominent advocate of the wave theory of light, which was initially proposed by Christiaan Huygens.