521 



TABLE 540.— REFRACTIVE INDICES OF LITHIUM FLUORIDE AT 23.6°C * 



Tenths of microns 



* Prepared by Leroy W. Tilton and Earle K. Plyler, National Bureau of Standards. 



TABLE 541.— INDEX OF REFRACTION OF ICELAND SPAR (CaC0 3 ) IN AIR 



TABLE 542.— INDEX OF REFRACTION FOR VARIOUS ALUMS 



'3 J* Index of refraction for the Fraunhofer lines 



c £ , a ___^ 



i?QH aBcDEbFG 



Aluminum alums i?Al(S0 4 ) 2 + 12H 2 * 



Na 1.667 17-28 1.43492 1.43563 1.43653 1.43884 1.44185 1.44231 1.44412 1.44804 



SMITHSONIAN PHYSICAL TABLES 



