
(d) The $P$-$N$ junction will conduct only when it is forward biased, $i.e.,$ when $- 5V$ is fed to it, so it will conduct only for 3rd quarter part of signal shown and when it conducts potential drop $5\ volt$ will be across both the resistors, so output voltage across $R_{2}$ is $2.5\ V$
$\therefore V_{0} = - 2.5\ V$