zone plate

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

1895–1900 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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In the future, some of these versions might add refractive power to the zone plate, achieving some level of target magnification.
Testing of the condenser zone plate's illumination revealed an error in its focusing ability.
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