Question
Light travels at 2.0×10^8 m/s in a medium. What is its refractive index if c=3.0×10^8 m/s?
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Correct Answer: D. 1.5
Explanation:
Refractive index is n=c/v.
N=3.0×10^8 / 2.0×10^8 = 1.5.
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