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  • n; n1, n2, n3, . . . are refractive indexes for a wave length ??=546 nm of the lens elements; and F denotes a face plate of the CRT, wherein each aspheric surface is expressed in a Cartesian coordinate system having X axis in a direction of optical axis and Y axis perpendicular to X axis, as follows: ##EQU7## where, C is a vertex curvature, K is a conic constant, AD, AE, AF and AG are constants. 2
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