In this report, we investigate the optical properties of Se_(60-x)Te_(40)Sb_x (0 ≤ x ≤ 12) chalcogenide glassy semiconductors using Diffuse Reflectance Spectroscopy (DRS) technique. From the reflectance spectrum, absorption coefficient of the material is derived usingKubelka - Munk function. In addition to this, the optical band gap of the material is calculated. Optical constants namely, extinction coefficient (k) and refractive index (n) are determined. Furthermore, other optical parameters such as optical conductivity, electrical conductivity, electrical susceptibility and velocity of light in the sample are calculated based on the relevant statistical formulae. Conclusively, coordinated concept of the material response to the irradiation of light is studied.
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