{HEAD ~ The beam splitter} 30 may split {TAIL ~ the image beam} C into a first projecting beam C1 and a second projecting beam C2 
{ HEAD ~ The beam splitter } 30 may split { TAIL ~ the image beam } C into a first projecting beam C1 and a second projecting beam C2
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH