Two narrow slits, one coherent source. Waves interfere on the far side, creating bright and dark bands that reveal the wave nature of light and matter. Toggle to particle mode and watch individual detections build the same pattern.
Intensity distribution at screen
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In wave mode, wavefronts propagate through two slits and interfere, producing the classic pattern. In particle mode, individual photons arrive at random positions, but their probability distribution follows the wave interference pattern — the heart of quantum mechanics.