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File:Inside the Fresnel Lens of the Lighthouse (33766615286).jpg - Wikimedia Commons
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Durability of Fresnel lenses: A review specific to the concentrating photovoltaic application - ScienceDirect
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An optofluidic tunable Fresnel lens for spatial focal control based on electrowetting-on-dielectric (EWOD) - ScienceDirect
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File:Fresnel lighthouse lens, first order, made by L. Sautter & Sons, Paris, installed in the south lighthouse on Thacher Island, 1861 - Cape Ann Museum - Gloucester, MA - DSC01350.jpg - Wikimedia Commons