Double slit experiment

Run the applet by clicking: . You can open multiple windows by clicking the button more than once.
Applet by Fu-Kwun Hwang


  1. You can change the distance between the slits (initial value = 150)
  2. You can change the wavelength of plane wave (initial value=15)
  3. Hit the "Start" button inside the window will start the animation
  4. You can also drag one of the slit to change distance between slits
  5. If you click or drag the LEFT mouse , the animation suspend. animation resume when it is released
  6. Distances from both slits to the mouse (d1,d2) are shown in the text field with the format "d1 - d2 = path difference". Numbers are divided by wavelength
  7. If you click or drag the LEFT mouse, the animation will suspend. Click the right mouse button again to resume
  8. Close the created window to quit