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