Double Reflection = Rotation

Please enable Java for an interactive construction (with Cinderella).

You can interactively change the position of the yellow line of reflection by dragging the red point and its direction by dragging at any other point. Similarly the direction of the light green 2nd line of reflection can be changed. The position, size and orientation of the white AO sign can be changed by dragging the two red points in the right side original.

Soli Deo Gloria. Created with Cinderella by Eckhard Hitzer (Fukui)