a second focusing reflector which, in the reflectance mode, directs {HEAD ~ source} provided {TAIL ~ converging radiation} through the objective to focus at the sample, and receives post sample diverging radiation from the objective and directs it toward the detector 
provided
a second focusing reflector which , in the reflectance mode , directs { HEAD ~ source } provided { TAIL ~ converging radiation } through the objective to focus at the sample , and receives post sample diverging radiation from the objective and directs it toward the detector
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH