The beam reaches {HEAD ~ the far end} of {TAIL ~ the hole}, and is reflected from a surface located at or adjacent the far end of the hole to illuminate the interior of the hole 
of
The beam reaches { HEAD ~ the far end } of { TAIL ~ the hole } , and is reflected from a surface located at or adjacent the far end of the hole to illuminate the interior of the hole
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH