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The Chemical Bath Deposition Method (CBD) was employed for deposition of Cd 1-x Zn x S (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) thin films. The chemically deposited Cd 1-x Zn x S thin films were characterized by using UV-Visible spectrophotometer. Transmission spectra show the blue shifting of absorption edge as the Zn content increased. The x = 0.8 composition shows maximum 78 % transmittance. The reflection in the blue portion of the incident spectrum was decreased as the Zn content increased. The (αhν) 2 versus photon energy (hν) curves shows tuning of band gap with Zn content. The observed band gap was 3.9 eV in the x = 0.8 composition. The effect of composition on refractive index, absorption index and other optical dispersion parameters were also investigated. The calculated values of average excitation energy E o approximately obey the empirical relation (E o =1.2 E g) obtained from single oscillator model.

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