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Absorption of light increases electricalconductivity in a solid. In case of cadmium sulphide (CdS) photoresistor, whenit is exposed to light the transition of activator electrons into theconduction band and charge exchange of traps with holes being created in thevalence band causing enhancement of conductivity. In the present setup, photocurrent is studied as a function of the voltage applied to the photo resistorat a constant irradiance. The angle of polarization is changed by polarizerfilter.