According to {HEAD ~ the teachings} of {TAIL ~ the present invention}, a system is provided which retains the versatility and benefits of reflective optics while eliminating the disadvantages of refractive optical systems 
of
According to { HEAD ~ the teachings } of { TAIL ~ the present invention } , a system is provided which retains the versatility and benefits of reflective optics while eliminating the disadvantages of refractive optical systems
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL 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