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if ghosts can be seen, or photographed, then they must be in some way physical, instead of purely supernatural, since, in order to be seen they must either emit or reflect photons, which are physical.
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Depending on who you talk photographic evidence is a viable way to prove existence of ghost. If you believe them then they must exist in a physical form as you suggest. Would you concede that they are a form of energy ? And are they sentient ?