Monochromatic plane-polarized light with angular frequency `omega` through a certain substance along a unifrom magnetic field `h`. Find the difference of refractive indices for right-hand and left-hand components of light beam with circular polarization if the verdet consatnt is equal to `V`.

Explanation

From problem `189`, we know that
`Deltan = (alpha lambda)/(pi)`
where `alpha` is the rotation constant. Thus
`Deltan = (2alpha)/(2pi//lambda) = (2alphac)/(omega)`
On the other hand `alpha_(mag) = VH`
Thus for the magntic rotation `Deltan = (2c VH)/(omega)`