The Proof
Youngs Expirement
This expirement was set up so that a light was aimed through a slit in a note card, after that note card there was a second, wit htwo slits on either side of the first slit then a final blank screen on the end. This proved the wave theory.
The wave nature of light causes the light waves passing through the two slits to interfere, producing bright and dark bands on the screen — a result that would not be expected if light consisted of classical particles.
Interference Pattern