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