the radius of curvature of {TAIL ~ either the first convex lens} or the second convex lens disposed in an optical path along which a color light having a relatively long wavelength passes being smaller than the radius of curvature of the other convex lens disposed in {HEAD ~ an optical path} along which a color light having a relatively short wavelength passes 
the radius of curvature of { TAIL ~ either the first convex lens } or the second convex lens disposed in an optical path along which a color light having a relatively long wavelength passes being smaller than the radius of curvature of the other convex lens disposed in { HEAD ~ an optical path } along which a color light having a relatively short wavelength passes
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH