Wavelength(nm) n k 195.3 1.583 2.12 206.6 1.4342 2.112 208.7 1.401 2.085 210.1 1.383 2.084 212.3 1.35 2.089 213.8 1.333 2.102 216 1.306 2.135 221.4 1.276 2.248 225.4 1.282 2.344 227.9 1.297 2.407 229.6 1.312 2.449 232.2 1.341 2.514 233.9 1.366 2.555 236.6 1.408 2.612 238.4 1.436 2.646 241.2 1.469 2.694 243.1 1.484 2.732 246 1.505 2.807 248 1.524 2.871 249 1.535 2.907 250 1.55 2.946 251 1.566 2.988 253 1.608 3.081 255.1 1.668 3.182 257.2 1.751 3.291 259.4 1.866 3.404 261.6 2.019 3.504 263.8 2.204 3.575 266.1 2.407 3.604 268.4 2.609 3.596 270.7 2.799 3.564 273.1 2.99 3.519 275.5 3.194 3.445 278 3.399 3.32 281.8 3.644 3.042 284.4 3.742 2.814 287 3.77 2.584 288.3 3.761 2.478 291 3.715 2.297 295.2 3.615 2.099 298 3.545 2.005 300.9 3.48 1.933 303.9 3.419 1.877 306.9 3.364 1.833 314.7 3.246 1.761 322.9 3.158 1.726 335.1 3.069 1.715 350.2 3.015 1.742 364.7 3.004 1.79 382.7 3.035 1.868 394.9 3.083 1.929 413.3 3.197 2.034 418.9 3.244 2.069 424.6 3.302 2.108 433.5 3.425 2.174 442.8 3.626 2.208 449.2 3.776 2.153 455.8 3.878 2.06 466.1 3.956 1.943 476.9 4.021 1.885 488.1 4.168 1.879 499.9 4.437 1.686 516.6 4.466 1.283 529.9 4.389 1.086 543.8 4.303 0.951 558.5 4.224 0.85 579.4 4.131 0.75 596.1 4.068 0.694 607.8 4.031 0.661 626.2 3.979 0.619 645.8 3.932 0.582 659.5 3.902 0.564 681.2 3.862 0.539 696.5 3.839 0.523 712.6 3.817 0.508 738 3.788 0.486 756 3.77 0.475 774.9 3.755 0.463 794.8 3.735 0.458 815.7 3.72 0.444 826.6 3.714 0.432 885.6 3.696 0.4 1033 3.613 0.33 1240 3.548 0.265 1378 3.516 0.237 1459 3.513 0.232 1550 3.512 0.21 1653 3.51 0.191 1771 3.5 0.183 1907 3.495 0.167