Light, when reflected off of a surface, loses a slight amount of energy,
due to the electrons in the reflective substance absorbing the photon's
energy and reemitting photons as the electrons fall to a lower energy
level. What if we built a sphere, whose interior is extremely
reflective, and around the exterior of the sphere, we place a
superconductive layer? As the light hits the reflective sphere's
interior, the electrons will jump to a higher level, since the electrons
do this, it should generate a very small electromagnetic counterpart,
which would be opposed by the superconductive layer, thusly causing the
electron to jump back to its original state with no energy loss? This
would not be O/U, but would definitely, IMO, be UNITY! Any takers on
this one?
BillP