Please wait for the animation to completely load.

A lens is shown with a source of parallel light rays. You can drag the source and change the orientation of its rays by dragging its hotspots (position is given in meters). Restart.

1. If an object were placed at x = 0 m, where would the image of that object be located?
2. Would the image be upright or inverted?

Problem authored by Melissa Dancy.