The Fresnel lens: An obsolete innovation finds a 21st-century role - Part 2

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 […] The post The Fresnel lens: An obsolete innovation finds a 21st-century role - Part 2 appeared first on Electrical Engineering News and Products.