Optical illusions with mirrors
The focal length of these two concave mirrors is the same. Look how the object on the bottom mirror reflects through the hole in the top mirror.
Getting very technical about concave mirrors (from Wikipedia)
(This means you don't have to know this, but some of you may be interested in how concave mirrors work)
Under construction -
When the object is between the mirror's focal point and the mirror itself, the image is magnified and upright
When the object is right at the focal point, there is no image.