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