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Which index of refraction represents the least optically dense material?

A) 2.65
B) 1.77
C) 2.42
D) 1.58

1 Answer

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Higher optical density means light moves more slowly through the medium. The speed of light in a medium is given by
c' = c/n
Where n is the index of refraction. So the least optically dense material is the one with the lower index of refraction,
n=1.58
User Binarus
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