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No naturally occurring material or compound with a negative index-of-refraction had ever been reported until this experiment.
Refractive index, also called index of refraction, measure of the bending of a ray of light when passing from one medium into another.
Air has an index of 1. Water's index of refraction is about 1.3.
Metamaterials thus have what's called a negative index of refraction.
Shelby R. A., Smith D. R., Schultz S. Experimental verification of a negative index of refraction.
Shelby, R. A., Smith, D. R. & Schultz, S. Experimental verification of a negative index of refraction.
Models for the wavelength dependence of the index of refraction of water.
A varying electric field applied to a medium will modulate its index of refraction.
By definition, the index of refraction for a vacuum is exactly 1.
We found the index of refraction for ice to be 1.31.
How much light slows down depends on the new medium's index of refraction, n.
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