Reflection About a Plane
In the applet below, the yellow triangular pyramid (with LARGE PINK VERTICES) has been reflected about the gray plane.
You can alter the appearance of the yellow pyramid (pre-image) at any time by moving any one (or more) of the LARGE PINK VERTICES.
You can change the orientation of the plane by moving any one (or more) of the 3 ORANGE POINTS it passes through.
Explore!
Be sure to answer the question that follows.
1.
Suppose you stand 4 ft away from a mirror. How far would your image be away from the glass (assuming you could "reach in" and measure)? How is your conclusion somewhat supported by any dynamics you see here?