hi all,
hi all there is one more equation called sellmier equation which shows the same, for convience i am attaching few links for cauchy equation for refractive index.
https://en.wikipedia.org/wiki/Sellmeier_equation
http://scienceworld.wolfram.com/physics/CauchysFormula.html
http://link.springer.com/referenceworkentry/10.1007%2F978-1-4419-6247-8_2057
you can also see video lecture on youtube for cauchy equation for refractive index.
hope i answer your question alistu
with regards