Math Is Fun Forum

I have a practical problem for you, it will be fun to see if you can solve it.I have a motor home and sometimes when I look in the side rear view mirrors, I see what is on the opposite side. This has caused problems as you could guess. There is a window behind the drivers seat that is parallel with the windshield (it is part of a section that slides out to make more room)and I thought that it was causing the reflections. However, when I covered that window with a flat black fabric I still see the reflection??? Any ideas? Thanks, Frank