{HEAD ~ first and second means} for subjecting {TAIL ~ an optical image} of an original to photo electric conversion with respectively wide and narrow wavelength ranges 
for subjecting
{ HEAD ~ first and second means } for subjecting { TAIL ~ an optical image } of an original to photo electric conversion with respectively wide and narrow wavelength ranges
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH