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