Final answer:
The question is concerning the current flow through two diodes connected in parallel and how to determine the characteristics of such a setup by using semiconductor diode equations.
Step-by-step explanation:
The student's question is about two diodes with different saturation currents (Is1 and Is2) that are connected in parallel, with their cathodes joined together. The scenario described involves understanding the diode current that flows under different biasing conditions. To calculate the current through each diode and the overall behavior of the circuit, one would need to apply equations specific to semiconductor diodes. The formula Inet = Io (eeVb/BT - 1) is typically used to calculate the current where Inet is the net current, Io is the reverse saturation current, Vb is the battery voltage, and T is the temperature in Kelvin.
Given that the student's question is incomplete and possibly concerning a parallel diode circuit, it is not possible to accurately answer without additional information. However, typically in such a circuit, the total current is the sum of the currents through each diode provided by the equations governing diode operation in forward or reverse bias.