An index of refraction less than one in a medium would imply that?
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the refractive index is the factory by which a wave slows down relative to the Speed of light in vaccum.if relative is less than one it means the wave is propagating faster than the speed of light.
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Refractive indices less than 1 can occur and if the phase velocity of the light in the medium is the faster than the speed of light. This often occurs close to the absorbance resonance of the material ....
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