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A method based on the Herzberger approach has been in- vestigated for the selection of glasses for the apochromatic correction at near-infrared (NIR) wavelength. The method avoids the algebraic com- plexity and simplifies the glass selection processes. Doublet and triplet glass combinations can be chosen directly from the plot of partial disper- sion versus V number. Good combinations of NIR doublets and triplets are given. Design examples show that the method is practical and effi- cient. © 1999 Society of Photo-Optical Instrumentation Engineers. (S0091-3286(99)02103-0)
Deqing Ren (Mon,) studied this question.