Negative-index metamaterial - Wikipedia

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Does any physical media exist with a refractive index less than 1? - Quora

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Is there any medium or material exist whose refractive index is less than one? - Quora

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Human Teleportation - Physics Discussion Forum

How can we design materials with negative refractive indices for perfect lensing? - Quora

What does it mean for a material to have a negative refractive index? - Quora

The reshaping of the Cinema EOS line will continue into 2021, there is a Cinema EOS C90 in the pipeline [CR2]