Pr(III) doped Zinc OxideBorax glasses with the chemical composition [(Wt %) 30ZnO – (70-x) Na2B4O7.10H2O – xPr6O11] (where x = 0.0, 0.1, 0.5, 1.0 and 1.5 wt %) of different concentration of rare earth element Praseodymium(III) have been prepared by conventional melt quench technique. The physical parameters like density, refractive index, number density,electronic polarizability, dielectric constant, polaron radius, inter–ionic separation, and oscillator strength of these glasses were calculated as a function of dopant concentration. The densities and refractive indices of these glasses were found to be in the range 2.1 g/cm3 - 2.49 g/cm3 and 1.601 – 1.91 respectively. Stability of the glass doped with 1.0 wt % Pr(III) was found to be 125. Keywords: Praseodymium, oscillator strength, absorption spectrum, electronic Polarizability.