Further definition of {TAIL ~ the produced line} of light, or scan line, is provided by non parallel sides which extend between {HEAD ~ the reflective surfaces} 
Further definition of { TAIL ~ the produced line } of light , or scan line , is provided by non parallel sides which extend between { HEAD ~ the reflective surfaces }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD