Are there any slit experiments where the photons only make two lines on the screen, as if they were little bullets fired though the slits? I have conducted many double and single slit experiments and they always show an interference pattern. I also know that when professional experiments are done in labs they get interference patterns too, even when only one photon at a time is sent though the slits; yet, many web sources talk about just two lines being formed in some test. Is that only for electrons and larger objects. It seems to me that photons never loose their interference pattern. Is this true?
Answer
Yes slits always produce diffraction unless as Arpad points out the slit is modified so that the photon has a possibility of being absorbed. But then this is not really a slit. Another example, all camera lenses diffract based on aperture size.
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