In our previous study, we have proposed a novel analysis method to determine the dispersion of refractive indices based on the plural incidence renormalized transmission spectroscopic ellipsometry. This method was, however, applicable only to the homogeneous cell. In this paper, we introduce the improved method to determine the wavelength dispersion of refractive indices by using the twisted nematic cell as well as by the homogeneous cell. Numerically calculated refractive indices of ordinary and extraordinary rays were in good agreement with the refractive indices experimentally measured by the Abbe Refractometer.