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Appendix A: Paraxial derivations
A. 1 Optical power of a system on k lenses
Paraxial theory shall be used to estimate the axial chromatic aberration of a system of k lenses as shown in Figure 4. Thebasic paraxial imaging by a single thin lens is given by many textbooks as [ 47, 51 ]: c iþ1 c i � U i h i; ðA: 1aÞ