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Why am I not getting the interference pattern on the wall?
The black line is the wall, without any light on it. The orange thing is a laser, and the red dot is the photon particle. The double-slit experiment is in blue and is self-explanatory.
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Well, maybe it's because you use a laser, and it's supposed to always send photons in a straight line, so they land on the wall between the two slits. But if the slits are close enough to each other (and to the laser beam), due to the uncertainty principle the photons should be able to move through them, and you should see the interference pattern. So it's all a question of setting up the distances between the elements of the experiment correctly.
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