Films of PEG after and before doped by carboxymethyle cellulose CMC were deposed on glass substrates by drop casting method. The absorbance and transmittance spectra have been recorded for all the deposited films in order to study the optical constants such as, refractive index, extinction coefficient, optical conductivity, real and imaginary parts of the dielectric constant, these additives effect all the parameters under study and enhance their value especially the optical absorption. The values of absorption coefficient refer to allowed direct transition.
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