Electrical conductivity of $S e$ is negligible in dark but increases to exposure to light. Because of this property it is used in:

photoelectric cells

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semiconductors

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high voltage batteries

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lasers

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Solution

The correct option is A photoelectric cells
In photoelectric cells, light energy is converted into electrical energy .Thus $S e$ is used in photocells because of its behaviour to become a conductor in presence of light.

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