It only show waves moving toward a common point P=(x,y,z), so that the interference can be shown at (x,y,z)

where r1 is the distance of bwtween P1 and P.

and

where r2 is the distance of bwtween P2 and P.

You can change the distance between source with slider for d, location of observed point with slider for x,wavelength with slider for lambda.

Two blue arrows represent phases for those two wave at P. i.e. represent (k*r1-w*t and k*r2-w*t).

**Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop.**This work is licensed under a Creative Commons Attribution 2.5 Taiwan License

- Please feel free to post your ideas about how to use the simulation for better teaching and learning.
- Post questions to be asked to help students to think, to explore.
- Upload worksheets as attached files to share with more users.