At which point do the electrons leave the plate capacitor?

Often teachers want to know: how large is the electron deflection $\Delta y$ at the end of the plate capacitor? This question can be answered with the formula derived from the equations of motion:$${y(x)=\frac{V_{\text p}}{4\cdot \text{d}\cdot V_{\text a}}\cdot x^2}\qquad (1)$$

Calculate the electron deflection $\Delta y_1$ when leaving the electric field.