The only way we can see something is that light must be able to enter our eye. And our mind will try to interpreted where is the image. The above two light paths you shown will not be able to enter our eye at the same time. Althought there can be many light paths emitted from the object. Only those paths which will be able to enter our eye can be used to interpreted where the object is. The light paths shown on the original documents will not be able to enter to your eye at the same time, so I create the simulation to show how the image could be formed. The red and blue light paths represents light emitted from two different points of the object. When those light enter our eye , our mind interpreted it is coming from the top of the mirage.