Beating the diffraction limit
Physics in Action: May 2004

Negative-index materials are being used to make lenses with perfect image reconstruction

In 1968 the Russian physicist Victor Veselago predicted the existence of a material with a negative index of refraction, which he termed "left-handed." He concluded that in the presence of such a negative-index material nearly all known wave propagation and optical phenomena would be substantially altered, although negative-index materials were not known to exist at the time." http://physicsweb.org/article/world/17/5/3

See Also

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Node
Refraction
Differentiation
Law of Refractive Indices
Refractive Index