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With thanks to Fu-Kwun Hwang.

1. The lens is outlined in blue.
2. The object is shown in black.
3. A real image is shown in gray and gray lines show the real light ray paths.
4. A virtual image is shown in light gray and light gray lines show the virtual light ray paths.
5. The +/- toggle button swtiches between a converging and diverging lens.
6. You can drag and drop the object along the horizontal axis to change the object distance.
7. Small red tick marks show the center of the lens and the distances f and 2*f.
8. You can open two windows to compare different cases.
9. You can manually change each of the parameters inside the textfields and see the results.
10. To quit the applet click the Close bar.

Click the Start button to begin.