Wave refraction in negative index media:
always positive and very inhomogeneous.
A Quick Introduction
A laser beam aimed into regular water is bent positively, i.e., on opposite side of the perpendicular to water surface) by refraction.
Prior to our work, researchers thought that a laser beam aimed into left handed water would refract negatively.
However, we have now proved that the inviolable requirements of causality or finite signal speed forbid such negative refraction of any actual waves by any real media.
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