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Define photo resistor. State its symbol and its two applications. 

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Definition: It is a type of semiconductor whose electrical resistance decreases as the intensity of incident light increases.

Applications: i) It is used for automatic lighting control. ii)It is used in the street light control. iii)It is used in photocopy machine to control density of toner. iv)It is used in security alarm. v)It is used in camera for Exposure meter.

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