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We test the validity of Feynman's idea that a two-slit experiment performedwith classical objects (bullets) does not produce observable interferencefringes on the detection screen because the Compton's wavelength of the bulletsis so tiny, that no real detector could resolve individual interferencefringes, thus producing only an average signal which is the observed smoothcurve. To test this idea, we study the two-slit experiment in two differentsituations using light to simulate both wave-like and particle-like bullets. Inthe first case, we consider coherent light with short wavelengths and in thesecond case incoherent light with not-so-short wavelength. While in the formercase (simulating Feynman's wave-like bullets) the interference fringes are sodense that they cannot be resolved by a detector, therefore resulting in anaveraged smooth signal, in the latter case (simulating Feynman's particle-likebullets), although the detector is fully capable of discriminating each fringe,the observed classical smooth pattern limit is produced because of the lack ofspatial coherence of the impinging field.

From waves to bullets: testing Feynman's idea on the two slit experiment