Considering the total wavefunction in this experiment leads to a relation stating that distinguishability squared plus visibility squared is at most 1. Deleting path information in this experiment changes the pattern in its quantum eraser variant. (10[1])This experiment was repeated by Anton Zeilinger with buckyballs (10[1])and Claus Johnson with electrons. Whether d sine theta equals an integer multiple (10[1])or half-integer multiple of the wavelength determines if constructive or destructive interference (10[1])occurs in this experiment. This experiment disproved the corpuscular theory. For 10 points, name this experiment that showed the wave-particle duality of light using an apparatus with two holes. ■END■ (10[1])