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Q.

What is the unit of the refractive index?


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a

Mass/volume 

b

Mass/velocity

c

No unit 

d

None of these   

answer is C.

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Detailed Solution

A refractive index does not have any unit.
"The refractive index of a medium is the ratio of the speed of light in a vacuum to the speed of light in the medium." Mathematically,
Refractive index of medium =speed of light in vaccum speed of light in the medium 
The Refractive index is the ratio of two same physical quantity. That is why it is a unitless quantity.
 
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