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The reason for the photodiodes are operated in reverse bias condition, when light falls on it.

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Current in forward bias is greater than in reverse bias

Current in reverse bias is greater than in forward bias

The fractional change in reverse bias current is greater than the fractional change in forward bias current.

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answer is C.

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Detailed Solution

A small change in current is not observable in forward bias as already a large current is flowing in the circuit. But a small change in current is detectable in reverse bias as reverse current is very less.

So the fractional change in reverse bias current is greater than the fractional change in forward bias current.

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