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=Applet: Lens Combination=

You can move the lenses around on the optical bench with a simple mouse drag. When you switch on the light, you can see how the light rays trace through the lenses. Dragging the lenses, you can observe how the the location of the intersection point and with it the focal length changes. © W. Bauer, 1999

http://www.lon-capa.org/~mmp/applist/optics/o.htm