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