zone plate

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noun Optics.

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

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Origin of zone plate

First recorded in 1895–1900

Strong currents and winds, however, mean any debris could be drifting up to 31 miles a day eastward, away from the impact zone.
Wreckage, Bodies of AirAsia Crash Found|Lennox Samuels|December 30, 2014|DAILY BEAST
Using a heatproof slotted spoon, remove the shallots to a paper towel-lined plate.
Make Carla Hall’s Crispy Shallot Green Bean Casserole|Carla Hall|December 27, 2014|DAILY BEAST
Allow beans to cool completely then remove to a paper towel-lined plate to dry.
Make Carla Hall’s Crispy Shallot Green Bean Casserole|Carla Hall|December 27, 2014|DAILY BEAST
For instance, Best Buy has over 40 million members in its customer loyalty program, Reward Zone.
Best Buy Punches Back at Amazon|William O’Connor|December 27, 2014|DAILY BEAST

By drawing boundaries against wrongful conduct, law provides a protective zone of freedom within those boundaries.
Red Tape Is Strangling Good Samaritans|Philip K. Howard|December 27, 2014|DAILY BEAST
Worst danger zone, the open sea, now traversed, but on land not yet out of the wood.
Gallipoli Diary, Volume I|Ian Hamilton
Well, the pudding moment arrived, and a huge slice almost obscured from sight the plate before us.
The Book of Anecdotes and Budget of Fun;|Various
He conducts this ceremony with the greatest solemnity, occasionally pronouncing these incantatory words, "Plate or shell, sah?"
Physiology of The Opera|John H. Swaby (AKA "Scrici")
We sat down pell-mell, anywhere, I next to Liszt, who kept putting things on my plate.
Music-Study in Germany|Amy Fay
He silenced her with a gesture, and, leaving a piece of toast half-eaten on his plate, he got up and went into his study.
Uncanny Tales|Various