Came here to say this, but the 1927 experiment was only the first with electrons. The first experiment with light was in 1803 by Thomas Young. This was the foun

Came here to say this, but the 1927 experiment was only the first with electrons. The first experiment with light was in 1803 by Thomas Young. This was the foundation of the wave theory of light. I stopped reading the article at this point. http://www.cavendishscience.org/phys/tyoung/tyoung.htm http://www.cavendishscience.org/phys/tyoung/tyoung.htm