The Ejs Two Source Interference model displays the interference pattern on a screen due to two point sources.  The simulation allows an arbitrarily superposition of the two sources and shows both the current intensity and running average of the intensity on the screen.  The separation, phase difference, amplitude, wave number, and phase velocity of each point source can be changed via text boxes.  You can modify this simulation if you have Ejs installed by right-clicking within the plot and selecting "Open Ejs Model" from the pop-up menu item.  

Ejs Two Source Interference model was created using the Easy Java Simulations (Ejs) modeling tool.  It is distributed as a ready-to-run (compiled) Java archive.  Double clicking the ejs_ehu_waves_interference.jar file will run the program if Java is installed.  Ejs is a part of the Open Source Physics Project and is designed to make it easier to access, modify, and generate computer models.  Additional Ejs models for wave optics are available.  They can be found by searching ComPADRE for Open Source Physics, OSP, or Ejs.

Please note that this resource requires at least version 1.5 of Java (JRE).