zone plate

noun Optics.

a plate or screen with alternating opaque and transparent concentric rings that focus light by diffraction.

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Nearby words

zone of illuviation, zone of interior, zone of leaching, zone of saturation, zone out, zone plate, zone refining, zone system, zone time, zonesthesia, zonetime

Origin of zone plate

First recorded in 1895–1900

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019