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In this section our purpose is to understand the fundamental concepts hidden behind the two-slit experiment. In order to avoid being engrossed with technical details we shall describe it as a thought experiment. The equipment then will be represented invariably by the same basic scheme reported above. One should, however, consider, that this is only a symbolic representation of a true experimantal equipment. The true equipment, actually, would show great differences (in dimension, shape, building materials, complexity) depending on whether it would be used to monitor balls, waves on water, light or electrons.
In order to know the details of the experimental device actually utilized in the electron interference experiment by Merli, Missiroli and Pozzi, you are advised to consult the backstage section of the site. But for the time being you may forget about such details, since they are not needed to understand the meaning of the experiment.
We now are ready to start with the presentation, and shall begin with the simplest and most intuitive case, that of tennis balls.
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