the radius of {HEAD ~ 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 an optical path along which a color light having a relatively short wavelength passes 
of
the radius of { HEAD ~ 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 an optical path along which a color light having a relatively short wavelength passes
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH