Dr Feld also has plans to use beams of different colours, since each colour has a slightly different refractive index in a given material.
ECONOMIST: Microscopy
Shining an appropriate light on such a wire from the outside would alter its refractive index (a measure of how fast light travelling inside the wire can move).
ECONOMIST: New-age crystals
When light travels through glass, it slows down (the amount it slows is measured by a number called the refractive index).
ECONOMIST: A way to detect Earth-sized planets around other stars
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