iS6 



Tables 189-192. 

 INDEX OF REFRACTION. 



TABLS 189. — Index of Refraction of Fluorlte In Air. 



k 



n- = rt^ _|_ 



where a'^ = 2.03S82 

 A/i = 0.0062183 



Al'-^=: 0.007706 

 ^^0.0031999 



fA.2_/X4or=/;2_|__ 



y= 0.000002916 

 (^- = 6.09651 

 71/2=0.0061386 



A„2 = 0.00884 



Af'i 



; + 



M, 



K' — K^ 



;i/;3= 5114.65 



A^-^ 1260.56 

 Ai, = 0.0940^ 



^' = 3S-SM 



(P) 



TABLE 180. — Change of Index of Refraction for 1<^ In Units of the 6th Decimal Place. 



C line, — 1.220; D, — 1.206; F, — 1.170; G, — 1.142. (PI) 



TABLE 191. —Index of Refraction of Iceland Spar (CaCO^) In Air. 



C Carvallo, J. de Phys. (3), 9, igoo. 



M Martens, Ann. der Phys. (4) 6, igoi, 8, igo2. 



P Paschen, Wied. Ann. 56, 1895. 



PI Pulfrich, Wied. Ann 45, 1892. 



RA Rubens-Aschkinass, Wied. Ann. 67, 18 



S Starke, Wied. Ann. 60, i8g7. 



Nitroso-dimethyl-aniliue has enormous dispersion in yellow and green, metallic absorption in violet. See Wood, 



Phil. Mag 1903. 



Smithsonian Tables. 



