A source(s) of electrons is kept at origin of the co- ordinate system and it shoots out electrons in xy plane with very small range of velocities. In the region x = 0 to x = d there is a uniform electric field `underset(E)to=-Ehati` which accelerates the electrons to speeds much larger than their original speed when they are ejected by the source. The electrons emerge from the field region, beyond x = d, travelling in straight lines. Prove that paths of the electrons, after they emerge out of the field, appear to be diverging from a point P having co-ordinates `(– d, 0).`