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