We experimentally prove that the famous single- and double-slit experiments are the scattered-light phase transition by slit edges rather than the conventional view of the transmitted-light effect by slits. The nature of the wave-particle duality of light quanta can be well understood with the help of the dynamic hypothesis of the quantized chiral photons having an intrinsic dual-energy (implicit electric field energy and hidden magnetic field energy) cyclic exchange property. With the

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... theoretical framework, the experimental diffraction pattern of the single slit is analytically determined and numerically confirmed.