Luneberg lens

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Luneberg reflector

A reflector making use of a number of concentric dielectric spheres of varying refractive index, capable of focusing incident energy onto a reflecting surface. The energy is eventually re-radiated along the incident path.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM