an all reflecting microscope objective whose optical elements are mirrors, and whose location is such that post sample radiation passes through {HEAD ~ the objective} in {TAIL ~ the transmission mode}, and both pre sample radiation and post sample radiation pass through the objective in the reflectance mode 
an all reflecting microscope objective whose optical elements are mirrors , and whose location is such that post sample radiation passes through { HEAD ~ the objective } in { TAIL ~ the transmission mode } , and both pre sample radiation and post sample radiation pass through the objective in the reflectance mode
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH