The base is preferably formed such that the registration surface 22 is in a precise location with respect to {TAIL ~ the optical system} so that {HEAD ~ the active surface} 16 of the substrate is at a focal point within a few microns 
The base is preferably formed such that the registration surface 22 is in a precise location with respect to { TAIL ~ the optical system } so that { HEAD ~ the active surface } 16 of the substrate is at a focal point within a few microns
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH