Luneburg lens
A Luneburg lens (original German Lüneburg-Linse) is a spherically symmetric gradient-index lens. A typical Luneburg lens's refractive index n decreases radially from the center to the outer surface.
A Luneburg lens (original German Lüneburg-Linse) is a spherically symmetric gradient-index lens. A typical Luneburg lens's refractive index n decreases radially from the center to the outer surface.
A Luneburg lens (original German Lüneburg-Linse) is a spherically symmetric gradient-index lens. A typical Luneburg lens's refractive index n decreases radially from the center to the outer surface.
Source: Wikipedia "Luneburg lens" · CC BY-SA 4.0
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