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The Fresnel lens is named after its inventor, the French engineer and physicist Augustin Fresnel, whose name is engraved on the École Militaire side of the Eiffel Tower. It quickly became essential to lighthouses, greatly extending the range of their beams and transforming maritime signalling, saving countless ships and lives. Beyond this engineering achievement, Fresnel also made major advances in the theory of light. Born in 1788, he died in 1827 at the age of 38. RFI English’s Dhananjay Khadilkar spoke with astrophysicist Pierre Léna, a member of the French Academy of Sciences. 🔔 Subscribe to our channel now: https://rfi.my/YTen 🌍 Get all the news from around the world live: https://www.rfi.fr/en/ 📲 Get the latest stories on Whatsapp: https://rfi.my/WAen and on Telegram: https://rfi.my/TGen Join us on Facebook: https://rfi.my/FBen Follow us on X: https://rfi.my/Xen Bluesky: https://rfi.my/BSen and Threads: https://rfi.my/THen See the news in pictures on Instagram: https://rfi.my/IGen Watch our TikTok videos: https://rfi.my/TKen