{HEAD ~ a reflector}, arranged between the optical lens and the second image lens, to reflect and change {TAIL ~ the direction} of the second projecting beam to the second image lens 
to change
{ HEAD ~ a reflector } , arranged between the optical lens and the second image lens , to reflect and change { TAIL ~ the direction } of the second projecting beam to the second image lens
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH