OPTICS LAB
Choose a mirror or lens. (Click on the place you want to put it). Install an object; then drag it back and forth, to see just how its position relative to the focus will have an effect on the location, size, and type of the image.
Clear everything, and install a mirror. Reverse the process by installing a light source. The mirror will throw a parallel set of light rays when the source is at the focus. This is how a headlight works. (Where does the source have to be to make low beams on a vehicle?)
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