Two slits, one probability pattern.
How do two open slits change detection probability?
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How do two open slits change detection probability?
Fit the components before testing.
Coherent amplitudes from the two slits add, producing alternating bright and dark detection probabilities. Which-path information removes the cross term. Single detections build the distribution over many trials.
Fraunhofer coherent equal-slit scalar model. No claim that classical mechanics alone solves quantum interference. Which-path setting models complete decoherence; no consciousness claim.
Create visible fringes spaced between 2 and 5 mm without which-path marking.
Compare interference fringes with and without which-path marking.