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