Question

Fill in the blank.

If c is velocity of light in air or vacuum and v that in a medium, then refractive index (n) =

Answer 1

The refractive index or index of refractionof a material is a dimensionless number that describes how light propagates through that medium.

$refractiveindexofmaterial=\frac{velocityoflightinvacuum}{velocityoflightinmaterial}n=\frac{c}{v}$