On page 54 of this issue, Rikken and van Tiggelen report a new optical effect. In their experiment, light is injected into an isotropic scattering medium in a direction perpendicular to an applied magnetic field. They see a light flux induced in the third direction, perpendicular to the field and to the injected light, which is directly proportional to the magnetic field. Is this a trivial effect or is it surprisingly new?
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