## College Physics (4th Edition)

The index of refraction of topaz is $1.62$
We can find the index of refraction of topaz: $n = \frac{c}{v}$ $n = \frac{3.0\times 10^8~m/s}{1.85\times 10^8~m/s}$ $n = 1.62$ The index of refraction of topaz is $1.62$.