Presumably light pressure would change the momentum of the beam-splitting mirrors in the interferometer version of Wheeler's delayed choice experiment. And it's not until the photon encounters the detector at the end that we consider it "observed", and presumably the probability field has collapsed (excuse my pop-science misunderstandings of the concept). But why does the photon's encounter with the splitter not count as a measurable, field-collapsing "observation", resulting in the photon either passing through or being reflected, instead of remaining as a probability and later interfering with itself?
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