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So once again, I must ask why must I accept that the photon passed through the slits? Also in the case of a closed barrier, why must I accept that the photon is still contained within the experiment area?
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Well, when we set up the experiment, we have something that produces photons, the slit, and a detector. When we have a slit present, we are able to detect the photon on the other side. When we don't have a slit present, the photon is not detected. Clearly the presence of the slit allows the photon to travel from the producer to the detector. Perhaps there are reasons other than the possibility that the photon travelled through the slit, but then why would the presence of a slit have an effect? Why the photon doesn't travel through the barrier doesn't really have any bearing on the question - the fact is that it stops the photon.