A thickness of the same substrate may determine {TAIL ~ a numerical aperture} of {HEAD ~ the optical element} 
A thickness of the same substrate may determine { TAIL ~ a numerical aperture } of { HEAD ~ the optical element }
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD