VIEW or DOWNLOAD ejs xml source
then click to translate strings for selected locale.

Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop.
You can drag any one of the black dot to change the following parameters: focus length(f), object position (p), height of object (h), slit width or slit position, position of lens ... If you want to download this applet, please check out [url=]What will happened if part of the light path were blocked[/url]