Question

explain the term refractive index differentiate between relative and absolute refractive index

Answer 1

Absolute refractive index is the ratio of RI of any medium with refractive index of air but relative RI is the ratio of refractive index of 2 different media.
speed of light in that medium (v), i.e. μ = c/v. The refractive index of medium 2 with respect to medium 1 is the ratio of the speed of light in medium 1 to that in medium 2.  i.e., μ21= v1/v2.

Answer 2

refractive index is the ratio of speed of vacuum to the speed in the medium.
it is denoted by 'n'.
n = c/v
relative refractive index is the refractive index in which we compare two mediums except vacuum.
but in absolute we only compare with vacuum.
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