Summing Over All Paths for Two Openings

Click anywhere on the display in the upperleft corner to select an endpoint on the screen. Click the "Left" or "Right" buttons to have the point on the screen move in the corresponding direction, and press "Stop" to stop the movement. The "Block Left Slit" and "Block Right Slit" buttons can be used to open and close the left and right slits respectively. The "Closer Slits" and "Farther Slits" buttons can be used to change the distances between the slits by either clicking once or clicking and holding. Finally, the "Show Path Vectors" button toggles on and off whether the individual path vectors will be displayed or just the final vector for the process.