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Earlier this month, in an intricate operation that required two helicopters, many boat rides, and countless hours of work, a handcrafted version of the original lens was returned to its former home at the outer reaches of the harbor.
Fresnel lens, succession of concentric rings, each consisting of an element of a simple lens, assembled in proper relationship on a flat surface to provide a short focal length. The Fresnel lens is used particularly in lighthouses and searchlights to concentrate the light into a relatively narrow