A first fixed reflecting surface of a parabolic group reflecting surface can include a focus on {HEAD ~ the second focus} of the first reflecting surface, and {TAIL ~ at least two second reflecting surface elements} 
A first fixed reflecting surface of a parabolic group reflecting surface can include a focus on { HEAD ~ the second focus } of the first reflecting surface , and { TAIL ~ at least two second reflecting surface elements }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL