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Question #89222
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What is the absolute refractive index of a medium?
A. The ratio of the speed of light in that medium to the speed of light in vacuum
B. The ratio of the speed of light in vacuum to the speed of light in that medium
C. The difference between the speed of light in vacuum and the speed of light in that medium
D. The sum of the speed of light in vacuum and the speed of light in that medium
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