Reverse Cerenkov effect

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Reverse Cerenkov effect

Reverse Cerenkov effect can be experienced using some special kind of materials called metamaterials (materials having negative permittivity and negative permeabilty). This means, when a charged particle (usually electrons) passes through a medium at a speed greater than the speed of light in that medium then particle radiates from a cone behind the particle rather than in front of it as in case of normal materials (with both permittivity and permeabilty positive).