What is the speed of light in a diamond that has an index of refraction of 2.3927?|||Recall that the speed of light in a substance is equal to the speed of light in a vacuum (3 x 10^8 m/s) divided by the refractive index of the substance.
So, speed of light in diamond = (3 x 10^8 m/s)/2.3927 = 1.25 x 10^8 m/s.
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