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