According to {HEAD ~ another aspect} of {TAIL ~ the invention}, an optical filter is provided comprising a reflective layer provided between first and second substrates 
of
According to { HEAD ~ another aspect } of { TAIL ~ the invention } , an optical filter is provided comprising a reflective layer provided between first and second substrates
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH