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We review the intensively discussed ideas about wave propagation andrefraction in media where both electric permittivity and magnetic permeabilityare negative. The criticism against negative refraction as violating thecausality principle is considered. Starting from the initial wave equations,refraction of beams at the boundary of a left-handed medium is analyzed. Thephysics of a perfect lens formed by a flat layer of a left-handed material isconsidered.Comment: 21 pages, 8 figure

What are the left-handed media and what is interesting about them?