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What are 1) forward bias and 2) reverse ...

What are 1) forward bias and 2) reverse - bias?

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What happens to the width of the depletion layer in ap.n junction diode when it is 1) forward-biased and 2) reverse -biased ?

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The current in the forward bias is known to be more (~mA) than the current in the reverse bias (~µA). What is the reason then to operate the photodiodes in reverse bias?