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In one double slit experiment, one physicist placed a convex lens before the back screen detector. The individual photons passed through the double slit then through the lens. The individual photons then go through the focal point, then a good distance after they reach the focal point they hit the detector screen. However, they don't produce an interference pattern, instead they produce a particle pattern of the two slits.
My question is what happens after the individual photons after the focal point that makes them produce a particle distribution instead of the interference pattern? Does the the focal point after the lens somehow destroy the interference pattern?
My question is what happens after the individual photons after the focal point that makes them produce a particle distribution instead of the interference pattern? Does the the focal point after the lens somehow destroy the interference pattern?