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cerenkov effect

Reverse Cerenkov effect

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).

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