The Cauchy's dispersion formula is:
- A$n = A + B\lambda^{-2} + C\lambda^{-4}$
- B$n = A + B\lambda^{2} + C\lambda^{-4}$
- C$n = A + B\lambda^{-2} + C\lambda^{4}$
- D$n = A + B\lambda^{2} + C\lambda^{4}$
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