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Furthermore, the minimum spherical aberration is greatly reduced if very high index

materials are available, although the improvement for indices between n = 1.5 to 1.8

,the normal range for visibleband optical glasses, cannot be dramatic.
     
      
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*SEIDEL WAVEFRONT ABERRATION COEFFICIENTS IN WAVELENGTHS (n=1.5168)
SRF W040 W131 W222 W220 W311
1 5.009013 2.168890 0.234781 0.295448 0.063964
2 1.720958 -1.441893 0.302020 0.151010 -0.063261

SUM 6.729971 0.726997 0.536801 0.446458 0.000703

*SEIDEL WAVEFRONT ABERRATION COEFFICIENTS IN WAVELENGTHS (n=1.75)
SRF W040 W131 W222 W220 W311
1 1.759908 1.111759 0.175579 0.241770 0.076365
2 2.057682 -1.724014 0.361113 0.180557 -0.075639

SUM 3.817590 -0.612255 0.536692 0.422326 0.000726

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