The subreflector is configured to receive {HEAD ~ each composite illumination beam} at the preselected location and direct the central ray of each composite illumination beam towards {TAIL ~ the main reflector} 
The subreflector is configured to receive { HEAD ~ each composite illumination beam } at the preselected location and direct the central ray of each composite illumination beam towards { TAIL ~ the main reflector }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL