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Q.

Is it true that the SI unit of refractive index is $m / s$ ?

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a

True

b

False

answer is B.

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Detailed Solution

The above statement is False.
“The refractive index of a medium is defined as the ratio of the speed of light in a vacuum to the speed of light in the medium.” This is also called as absolute refractive index. The SI unit of speed is

m / s

. As the refractive index is the ratio of the same quantities, i.e., speed, the refractive index has no unit.
The correct statement would be that the refractive index has no SI unit.

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