The dimensional formula for relative refractive index is:
Grade: 10

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answer is B.

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Detailed Solution

Concept: The refractive index is referred to as the relative refractive index when light goes from one medium to another, and as the absolute refractive index when light travels from vacuum to another medium.Relative refractive index

is a ratio of refractive index of medium

to refractive index of vacuum

.
Hence, dimensionless

Hence, option 2 is correct.

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