In the present work, thelinear optical properties of Novolac: Epoxy films(10mm thicknesses) have been calculated depending on the absorbance and transmittance spectra at wavelength range (300-900 nm). The linear optical parameter include calculation (refractive index n, absorption coefficienta , extraction coefficient k.Real and imaginary part of dielectric r e , i e , and optical and electrical conductivity σop, σe). The surface, volume energy loss function and electronic interband transition strength have been calculated depending on dielectric constant of the bland. The values of direct and indirect energy gap have been found using Tucc procedure ,equals to [( C1 (2.295 ev), C2 (2.408 ev) , C3 (2.655 ev) and C4 ( 3.792 ev)], and[ C1 (1.95 ev), C2 (2.025 ev) , C3 (2.06 ev) and C4 ( 3.553 ev)]respectively. In addition to that, ithave be foundalso that the type of electronic transmission is indirect.
