Another example of {HEAD ~ improvement} in structure of {TAIL ~ an optical element} is shown in FIG 11 
Another example of { HEAD ~ improvement } in structure of { TAIL ~ an optical element } is shown in FIG 11
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH