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In this experiment light from a 630-680nm laser is first passed through a 0.65mm horizontal slit at 0.120m from the laser. Next, after traveling another 0.45m it passes through a 0.50mm vertical slit. The two single slits eliminate any radial paths.
At 3.795m further a barrier with 0.30mm double slits, separated by 2.30mm, is positioned so that the right slit is in the dark space between the first and second peripheral bans in the left side of the pattern from the vertical slit and the left slit is in the light of the adjacent second peripheral ban.
Sciconoclast: I don't think you're contradicting quantum theory, but instead are challenging the Copenhagen interpretation of quantum theory.
Taking a stab at explaining this. A small wave passing through the dark slit would interfere with all the waves or a large single wave passing through the lighted slit. However, ever since Albert and Neils the dominate view is that light is not a wave. Although, quantum theory does mimic classical wave theory and it is still used for convenience by optical engineers.
As for the faint appearance of the double slit pattern in the picture; I am sure you are aware that interference patterns oscillate or move and that the longer the exposure the more muddled the pattern. In this experiment the light has been separated into small bans by two single slits and one double slit. It takes a long exposure to get these pictures.