Suppose refractive index μ is given as μ=A+B/λ2 where A and B are constants and λ is wavelength, then dimensions of B are same as that of

We know that μ= velocity of light in vacuum  velocity of light in medium ∴ μ is dimensionless. As left-hand side is dimensionless, hence each term on right hand side should be dimensionless ∴ Bλ2= dimensionless i.e., B should have dimensions of λ2Now [B]=λ2=L2= area