| Mirror: To place the mirror, click at the point above the central axis where you want the top of the object to appear. The new mirror is centered on the central axis. The mirror reflects all incident light on the blue side and absorbs all light on the black side. When the Select button is pressed, you can move and resize the mirror. You can also change the focal length of the mirror by click-and-dragging on the hotspots indicated below.
| Another way to set the focal length is to choose a value in the mirror's Properties Box. The Properties Box also lets you select the curvature of the mirror. You can make it convex (default), concave, or flat. You can also choose to display the mirror's focus (it appears as an X on the central axis) or model the mirror as an ideal mirror.
An alternative view of this object is available.