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• File:Fifth-order Fresnel lens, lighthouse at Key West, FL, US.jpg - Wikipedia

File:Fifth-order Fresnel lens, lighthouse at Key West, FL, US.jpg - Wikipedia

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IAL 6: Electromagnetic Radiation

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Fresnel lens - Wikipedia

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File:Fourth order Fresnel Lens originally from Cape Arago Lighthouse OR.jpg - Wikipedia

none: 2015

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none: 2019

Key West Lighthouse - Wikipedia

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