The table lists the index of refraction for various substances at20 degrees C for light with a wavelength of 589 nm in a vacuum.Through which substance will light with a vacuum wavelength of 589nm travel with the greatest speed?

Substance n
fused quartz 1.458
ethyl alcohol 1.362
crown glass 1.520
carbon tetrachloride 1.461
crystalline quartz 1.544

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