This illumination follows {TAIL ~ a path} through {HEAD ~ the objective} toward the sample, and again, after reflection, through the objective toward the detector 
This illumination follows { TAIL ~ a path } through { HEAD ~ the objective } toward the sample , and again , after reflection , through the objective toward the detector
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH