Index of Refraction: If the index of refraction of a material is 2, this means that light travels
A. 2 times as fast in air as it does in vacuum.
B. 2 times as fast in the material as it does in air.
C. 2 times as fast in vacuum as it does in the material.
D. 2 times as fast in the material than it does in vacuum.
E. 1/2 as fast in air as it does in the material.
Answer: C
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