Wavelength(nm) n k 250 0.156 2.296 260 0.169 2.36 270 0.178 2.487 280 0.184 2.585 290 0.198 2.697 300 0.212 2.808 310 0.22 2.915 320 0.234 3.022 330 0.253 3.135 340 0.26 3.243 350 0.278 3.349 360 0.284 3.458 370 0.31 3.561 380 0.319 3.672 390 0.336 3.78 400 0.371 3.885 410 0.378 3.996 420 0.39 4.122 430 0.427 4.221 440 0.443 4.342 450 0.483 4.446 460 0.496 4.533 470 0.523 4.656 480 0.546 4.751 490 0.564 4.859 500 0.604 4.969 510 0.627 5.086 520 0.659 5.172 530 0.676 5.27 540 0.697 5.348 550 0.738 5.43 560 0.778 5.532 570 0.804 5.626 580 0.846 5.735 590 0.88 5.857 600 0.912 5.953 610 0.936 6.022 620 0.992 6.093 630 1.054 6.202 640 1.087 6.266 650 1.145 6.352 660 1.176 6.43 670 1.209 6.508 680 1.292 6.583 690 1.355 6.656 700 1.408 6.727 710 1.459 6.805 720 1.529 6.858 730 1.609 6.896 740 1.677 6.955 750 1.755 7.002 760 1.844 7.037 770 1.892 7.05 780 1.974 7.056 790 2.048 7.047 800 2.114 7.02 810 2.152 6.974 820 2.157 6.949 830 2.137 6.864 840 2.08 6.789 850 2.002 6.702 860 1.88 6.694 870 1.774 6.676 880 1.678 6.736 890 1.588 6.666 900 1.357 6.541