Define forward bias.

How does the height of potential barrier change in forward bias and reverse bias?

Assertion (A): Ideal diode shows zero resistance in forward bias and infinite resitance in reverse bias. Reason (R): Depletion region of a p-n junction diode extends in reverse bias and contracts in forward bias.

The resistance of P-N-junction diode in forward bias is

Emitter base connection is kept in forward bias — why?

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