Wavelength(nm) n k 250 2.646 0 260 2.6025 0 270 2.5603 0 280 2.5205 0 290 2.4839 0 300 2.4509 0 310 2.4217 0 320 2.3962 0 330 2.3739 0 340 2.3544 0 350 2.3372 0 360 2.3219 0 370 2.3081 0 380 2.2956 0 390 2.2843 0 400 2.2741 0 410 2.265 0 420 2.2569 0 430 2.2499 0 440 2.2439 0 450 2.2388 0 460 2.2347 0 470 2.2312 0 480 2.2285 0 490 2.2264 0 500 2.2247 0 510 2.2233 0 520 2.2222 0 530 2.2212 0 540 2.2202 0 550 2.2193 0 560 2.2182 0 570 2.2171 0 580 2.2159 0 590 2.2145 0 600 2.2131 0 610 2.2115 0 620 2.2098 0 630 2.2081 0 640 2.2063 0 650 2.2045 0 660 2.2028 0 670 2.201 0 680 2.1993 0 690 2.1976 0 700 2.1959 0 710 2.1943 0 720 2.1928 0 730 2.1912 0 740 2.1897 0 750 2.1883 0 760 2.1869 0 770 2.1855 0 780 2.1842 0 790 2.1829 0 800 2.1816 0 810 2.1802 0 820 2.1789 0 830 2.1776 0 840 2.1762 0 850 2.1748 0