Two adjacent $($ideal$)$ parallel plate capacitors with given geometrical dimensions l$1,$ l$2$ and h$,$ as shown schematically in Fig. $1,$ are employed as a deflection system for the motion of particles of positive charge q and mass m$.$ The upper capacitor plates are grounded $($zero potential$)$ while the lower plates can be maintained at desired controlling potentials V$1$ and V$2.$ It is observed that the particle entering this system with the horizontal velocity v at point A$,$ exits the system at point B$,$ continuing to move strictly horizontally but displaced $$upward$$ from the entry point by distance d$.$ Find such V$1$ and V$2($including their polarities$)$ that were used to realize the described deflection effect on the particle in the plane of Fig. $1.$ Gravity effect is negligible.