A diode D is used in a 1/2 wave rectifier circuit as shown in the schematic diagram. A forward-bias test point is provided for this diode, indicating a forward voltage drop of V0 when the forward current is I0=1mA. In this circuit, the diode's actual current is measured to be IF. Given this current, what is the actual output voltage? Assume the diode has parameter n=1. (Note: use the function log(x) to calculate the natural logarithm of x)