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Calculate the speed of light in a substance given the index of refraction.

The index of refraction of carbon tetrachloride is 1.46. The speed of light in this material is:

A) less than 1.00 x 10^6 km/s

B) between 1.00 x 10^6 and 2.00 x 10^6 km/s

C) between 2.00 x 10^6 and 3.00 x 10^6 km/s

D) greater than 3.00 x 10^6 km/s

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The index of refraction of a material is defined by the speed of light ...

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The explanation for the answer is clearly stated.