The speed of light in crown glass is #1.67*10^8#. What the index of refraction?

1 Answer
Eddie
Oct 1, 2016

#n approx 1.8#

Explanation:

Refractive index is #n = c/v#

With speed of light in vaccuum #c approx 3.10^8 m/s# and assuming the units are the same for the figure you quote, we have

#n = (3.10^8)/(1.67.10^8) approx 1.8#

So light travels 1.8 times faster in a vacuum than in crown glass.

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