2011 Like ordinary cellophane, the birefringence can split light into separate directions, leading to weird optical illusions, distortions, and magnification-all from the simple presence of the magnetic field. Douglas Main, Discover Magazine, 4 Nov. Ethan Siegel, Forbes, Icelandic spars are crystals of calcium carbonate which have a special property called birefringence: light hitting the mineral is split and follows two parallel paths through it, which explains how calcite makes objects look doubled. Recent Examples on the Web When light passes through this region of space where vacuum birefringence occurs, it gets polarized, but only if this phenomenon inherent to quantum field theory is true.
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