Fresnel mirrors

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plural noun Optics.

two plane mirrors joined together in a way that makes them useful for studying interference patterns.

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Origin of Fresnel mirrors

First recorded in 1965–70; see origin at fresnel

It almost mirrors the Buddhist cycle of life, death, and rebirth.
The Buddhist Business of Poaching Animals for Good Karma|Brendon Hong|December 28, 2014|DAILY BEAST
Neither Iran nor Hezbollah has confirmed these links, but the rhetoric and campaign style of the Houthis mirrors that of both.
Yemen’s a Model All Right—For Disaster|Michael Shank , Casey Harrity|November 14, 2014|DAILY BEAST
The academy has faux-marble halls, long mirrors, and gold-color-painted details.
Russia’s Gold Digger Academy|Peter Pomerantsev|November 11, 2014|DAILY BEAST
The lines in Until We Could about love are gorgeous: “Two mirrors face to face with no end… Yes, I counted your eyelashes.”
Watch This Amazing Ode to Marriage Equality, by Inaugural Poet Richard Blanco|Tim Teeman|September 21, 2014|DAILY BEAST

“Much of what happens in the show mirrors the story of Siddhartha,” Jablonski says.
Is ‘Satisfaction’ a Love Story That’s Too Real About Sex and Marriage?|David Masciotra|September 19, 2014|DAILY BEAST
Glass chandeliers were suspended from the roof; handsome mirrors were intermixed with the prints and pictures.
Journal of a Voyage to Brazil|Maria Graham
Grace was the Gibson type, tall and slender and fair-haired and very pretty, with a decided liking for looking in mirrors.
The Outdoor Girls in the Saddle|Laura Lee Hope
In practice it is seldom necessary to touch the adjusting screws of the mirrors themselves.
Photographs of Nebul and Clusters|James Edward Keeler
The lookouts gave free vision in all directions except directly below the hull, and a series of mirrors corrected this defect.
Astounding Stories, May, 1931|Various
Inside there was a fire burning, furs strewn about the floor, metal urns and even mirrors hung on the rough stone walls.
Valley of the Croen|Lee Tarbell