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A photo resistor consists of a device that change its electrical
Ohmic resistance when light is applied. Thus it is also called
as photo conductive cell or the Light Dependent Resistor abb.
L.D.R. The active region of photo resistor is a thin film of cadmium,
selenium, a metalliic helide or a metallic sulphide. When these type
of materials are exposed to the light radiation, free electrons are
created as photon energy drives them from a valence
band into the conduction band.