What would truly be baffling, is if the experiment were to be performed with two slits, each divided by a suitable partition from the other, throughout the length of the path the electron takes, and the experiment repeated.
If closing or opening one slit affected the other, in this arrangement, it would be amazing.
There is no question the same result would obtain in that situation. Yes, be amazed.
I don't think you can construct this. What you are describing is two single slit experiments, side by side.
In other words, if the partition runs the full length of the path, one slit or the other will be isolated from a source of electrons (or light, or protons), and will emit nothing.
“What would truly be baffling, is if the experiment were to be performed with two slits, each divided by a suitable partition from the other, throughout the length of the path the electron takes, and the experiment repeated.”
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That has been done, and also by splitting the beam with prisms into two temporally simultaneous beams, and in both cases, with the same results.