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Parimi, Patanjali V.; Lu, Wentao T.; Vodo, Plarenta; Sridhar, Srinivas
Nature, 11/2003, Letnik: 426, Številka: 6965Journal Article
The positive refractive index of conventional optical lenses means that they need curved surfaces to form an image, whereas a negative index of refraction allows a flat slab of a material to behave as a lens and focus electromagnetic waves to produce a real image.
