write the units of refractive index
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Refractive index of a medium is the ratio of the speed of light in vacuum to the speed of light in the medium. Therefore, it has no units.
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Answer:
Refractive index has no units because the refractive index is the ***ratio*** of the speed of light within the material of interest divided by the speed of light in a vacuum, thus the consistent units of measure (meters per second, or kilometers per second, etc.)
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