This demonstration shows the [url=https://en.wikipedia.org/wiki/Double-slit_experiment]Double-slit experiment[/url]. It has plane waves hitting a barrier at x=0 and passing through two "slits" in the barrier at points A and B. The resulting circular wave fronts interfere and give the double slit interference pattern on the right. Press the [i]Show Maxima[/i] button to trace the maxima and see the maxima quickly displaying the classic linear behavior as they approach the asymptotes of their respective hyperbolas.[br][br]It runs more smoothly in the desktop app where you can increase the number of wave fronts being tracked to get a better view of the interference pattern.