In the given circuit the input voltage Vin is shown in figure. The cut-in voltage of p–n junction diode
(D1 or D2) is 0.6 V. Which of the following output voltage (V0) waveform across the diode is correct?




Till |V|≤0.6 V
|V0|=|V|
So, correct graph is D.

The following are the graphs of potential barrier versus width of the depletion region for a p-n junction diode. 
Which of the following is correct?
A P-N junction is an interface or a boundary between two semiconductor material types, namely the p-type and the n-type, inside a semiconductor.
in p-n junction diode two operating regions are there:
There are three biasing conditions for p-n junction diode are as follows: