We report steady-state photo-induced absorption !(PIA) and photo-induced reflectance (PIR) in films of poly[2-methoxy-5-(2'-ethyl-hexploxy)-p-phenylene vinylene] (MEH-PPV) and poly[2,5-bis cholestanoxy-1,4 phenylene vinylene] (BCHA-PPV) blended with fullerenes, Absorption from the metastable charge-transferred state is probed by PIA; the modulated absorption spectrum causes changes in the real part of the index of refraction, Delta n, which can be measured directly by PIR. The charge transfer gives rise to pronounced features in Delta n, including vibrational structure in the mid-infrared, and broad spectral windows with negative Delta n in the mid-and near-infrared. Our measurements over a wide spectral range (0.05 eV-1.9 eV) allow quantitative comparison of Delta n obtained from PIR with that obtained from Kramers-Kronig transformation of the PIA data, We find good agreement throughout the infrared, indicating that our method for measuring Delta n is useful as an analytical tool for optical characterization and for prediction of optical spectral ranges for nonlinear optical response.