Polyvinyl Pyrrolidone (PVP), Carboxymethyl Chitosan (CMCH) films and their 50/50(wt/wt %)(PVP/CMCH) blend sample were prepared using casting technique. X-ray diffraction technique revealed that, the prepared samples were miscible. The optical absorption was recorded at room temperature in the wavelength range of 190-800 nm. Fitting of absorbance data proved that the transition is indirect allowed with optical band gap, Eopt, of 3.60 eV for pure PVP film and 3.94eVfor pure CMCH. The blend sample containing 50wt% PVP has an optical band gapand band tail with 3.80and 0.40eV.Variation of optical band gap and band tail values under blending of pure polymers gives an indication of structural modification of blends. Optical parameters such as refractive index, complex dielectric constant and color parameters were studied.