Dear student,

We have to find the Reverse Saturation Current i.e. Is.

Now, Forward Bias Voltage/Vd = 0.27 Volts

Temperature = 300'K

Diode Current/Id = 50mA

Now, we will use the current equation.

Id = Is . ( e^Vd/nVt - 1 )

Now put all the values in this given equation, we have

Is = 1.46 microA

Hope it helps.