To measure light intensity,we use:

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(C) For detecting the intensity of light,we use a photodiode in reverse bias.When a photodiode is reverse-biased,the width of the depletion layer incr

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photodiode with reverse bias

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(C) For detecting the intensity of light,we use a photodiode in reverse bias.When a photodiode is reverse-biased,the width of the depletion layer increases compared to forward bias,and a small reverse current (dark current) flows through the diode.When light is incident on the junction,electron-hole pairs are generated in the depletion layer in large amounts due to the broad depletion layer. These charge carriers can easily cross the barrier,contributing to the current across the diode.Therefore,in reverse bias,the diode converts incident light into current more significantly due to the broad depletion layer,making the photocurrent significant compared to the forward bias current.

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