You can change the focal distace of the paraboloid changing the zScale value. The reflected image will be bigger or smaller. Also moving the firgure closer or more far awy the mirror will change the size. The parabolid is not a flat mirror, so it has a lens effect.

It looks that negative refraction indexes are not working in Pro 2012, the same with LuxRender. Is a pity to not be able to play with metamaterials

Stupidity also evolves!