vmaterial = c/ηmaterial
If η = 2, then:
v = c/2
If the index of refraction of a material is 2, this means that light travels
A) 2 times as fast in the material as it does in air.
B) 2 times as fast in vacuum as it does in the material.
C) 2 times as fast in the material than it does in vacuum.
D) 2 times as fast in air as it does in vacuum.
E) 1/2 as fast in air as it does in the material.
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