The way this interesting device works it by using the two nearly identical mirrors placed on top one another. The position of the focal points of the mirrors are very important. For the top mirror, the focal point is near the bottom and the middle of the bottom mirror. For the bottom mirror, the focal point is hovering right in the hole of the top mirror. That way the light emanating from the object goes out in all directions and reflects off of the top mirror. These rays then reflect directly downward and hit the bottom mirror. From there, these rays are reflected up towards the hole in the top mirror and converge. One interesting thing to note is that the mirrors end up inverting the image as pointed out by the reversed direction of the arrow in my diagram.
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