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Lens makers go flat out Optics researchers in Canada have made a liquid-crystal lens with a focal length that can be adjusted by applying a voltage. The lens, which is flat, could have applications in mobile phones, laser cavities and surveillance equipment. Vladimir Presnyakov and Tigran Galstian of the University of Laval in Quebec made their lens by adding a small amount of a light-sensitive monomer to a liquid crystal in a commercially available electro-optic cell and irradiating it with a laser beam (J. Appl.
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