Does the photon actually split in two and travel partly through one slit and partly through the other? Most physicists would object to this way of phrasing things. They would insist that while the two routes open to the particle must both contribute to the final effect, these are just alternative routes, and the particle should not be thought of as splitting into two in order to get through the slits. As support for the view that the particle does not partly go through one slit and partly through the other, the modified situation may be considered in which a particle detector is placed at one
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