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I would like to investigate and confirm the wave-particle duality of light.

As an experiment to prove the wave nature I will shine a laser beam through a narrow slit, and use Heisenberg's Uncertainty Principle, [itex]\Delta p \Delta x \geq \hbar[/itex]

I will change the size of the slit, delta X, and measure the size of the smear when projected at lenght L, according to

[tex]X_L = \frac{\frac{\hbar}{\Delta x}}{\frac{h}{\lambda}}L[/tex]

To prove the wave nature of light, I'm thinking of doing Young's double-slit experiment, but I have some trouble finding out what to look for. I need an independent and a dependent variable, any suggestions?