Question

(c) What is the unit of refractive index? Give reason for your answer.​

Answer 1

Answer:

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.

Explanation:

because the refractive index is expressed as a ratio of the speed of light in vacuum relative to that in the considered medium . As it is a ratio it is unitless . The units m/s or km/h cancel out each other.

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Answer 2

Answer:

Refractive index" is a dimensionless unit.

Explanation:

This is because the "refractive index" of any object is the "ratio" of "speed of light" in vacuum and "speed of light" in given medium.

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