Bismuth borate tellurite glasses having composition    where  are prepared using the conventional melt quenching technique. The amorphous nature of these glasses is examined by X-ray diffraction analysis at room temperature. Spectral reflectance and transmittance of the glass samples are measured with a spectrophotometer across the spectral range 0.2-2.5mm. These measured values are introduced into analytical expressions to calculate the real and imaginary parts of the complex refractive indices. Abbe’s numbers, dispersive parameters of Wemple-DiDomenico dispersion’s relation, molar refraction and molar polarizability are deduced. Ionic parameter, direct and indirect allowed transitions optical energy gaps are calculated from absorption coefficients. Effects of substituting  instead of  on these linear optical properties of the prepared glasses are studied.

bismuth borate tellurite glasses, linear optical properties, complex refractive index, spectral dispersion.