In the double-slit experiment with electrons, the electron gun, or the source of electrons, is typically aimed towards the double-slit apparatus. However, it is important to note that the specific setup and design of the experiment can vary.
In the most basic version of the experiment, the electron gun is placed at a distance from the double slits, and the electrons are directed toward the slits in a collimated beam. The electrons then pass through the slits and form an interference pattern on a screen or detector placed behind the slits.
The purpose of aiming the electron gun towards the double slits is to ensure that the electrons are directed towards the slits and pass through them. This allows for the interference and diffraction patterns to be observed.
It is worth mentioning that there are variations of the experiment where the electron gun can be placed at different angles or positions relative to the slits to investigate different aspects of the wave-particle duality of electrons. These variations may involve altering the distance between the electron gun and the slits, changing the electron beam's angle, or using additional optical elements to manipulate the electron wavefunction. The specific experimental setup will depend on the goals and objectives of the research being conducted.