The Fresnel lens: An obsolete innovation finds a 21st-century role

Part 1 examined a major technical problem of the 19th century: improving the efficiency and reach of the lighthouse beam, and why simply going “bigger” would not be possible. A new way of seeing the problem New ideas were needed, and the French government in the early 1800s was aware of the problem, even linking

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The Fresnel lens: An obsolete innovation finds a 21st-century role

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