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