"Projected" is exactly the word to use.
The same thing happens with any concave mirror, including the countertop ones used for plucking eyebrows. Get far enough away from it and look at yourself in the mirror. The image isn't behind the mirror like a regular mirror, the image is upside down floating in the air in front of the mirror.
The light waves hit the concave surface and are focused to a point in front of the mirror (upside down) in the same way EMR strikes a satelite dish and is focused on the receiver positioned in front of the dish. Your eyes focus on the point where the light waves converge and Voila! you see an image floating in the air.
With 2 parabolic mirrors facing each other (one with a hole in it) the light goes through the hole and strikes the object. That light is reflected off the object to the inner surface of the top mirror, back down to the inner surface of the bottom mirror, and back out the hole making a perfect image of the object (when viewed at an angle) focused at the space made by the hole - and there you see it "floating".
BTW - here's how the radiometer works:
Notice how the sails on the radiometers spin after the light is shining on them. A radiometer consists of a set of vanes, each shiny on one side and blackened on the other.
When the light strikes the shiny surface, most of it is reflected away, but when it strikes the blackened surface, most of it is absorbed, raising the temperature of the surface. The vanes turn because the air near the blackened surface becomes hotter and recoils away, exerting a greater pressure on it than on the shiny surface.
The action of the radiometer depends upon striking a balance between molecular drag and recoil. At higher pressures, drag will dominate and the vanes will fail to spin. At lower pressures, there are too few recoiling molecules to drive the vanes. The optimum balance occurs at a pressure of about 60 mTorr (60 microns Hg).
[edit - further research shows that this is not exactly the correct explanation, but relatively close to what happens]