Zone Plate -- from Eric Weisstein's World of Physics

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Optics "> Interference "> Interference Phenomena v

Optics "> Optical Components "> Lenses v

Zone Plate

A device capable of focusing light by diffracting light from annular "zones" which interfere constructively. Non-zone areas which interfere destructively are blocked with an opaque material.

Fresnel Lens, Lens