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This happens because light refracts from two different substances with the same index of refraction so the materials cannot be distinguished from one another.
Metamaterials thus have what's called a negative index of refraction.
Air has an index of 1. Water's index of refraction is about 1.3.
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.
The CEM is modeled using Dill's model for positive photoresist and a bleachable index of refraction.
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.
Wave nature of light: Maxwell's equations, propagation through media with varying index of refraction (e.g. fibers).
Models for the wavelength dependence of the index of refraction of water.
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No naturally occurring material or compound with a negative index-of-refraction had ever been reported until this experiment.
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