512 



TABLE 525.— INDEX OF REFRACTION OF EASTMAN KODAK CO. NONSILICA 



GLASSES (1949) 



Part 1 



Type EK— 110 EK— 325 EK— 330 EK — 450 



(EK— 110 (EK— 32 (EK— 33 (EK— 45 



—5328) EK— 210 £A— 310 —2641) — 2734f) —29) 



Index 



«» 1.71786 1.75861 1.77301 1.77288 1.78280 1.83767 



n, 1.71227 1.75201 1.76538 1.76518 1.77532 1.82832 



n, 1.70554 1.74413 1.75638 1.75607 1.76643 1.81738 



n D 1.69680 1.73400 1.74500 1.74450 1.75510 1.80370 



(1.6973) (1.7442) (1.7555) (1.8016) 



nc 1.69313 1.72979 1.74033 1.73973 1.75043 1.79814 



n A ' 1.68877 1.72484 1.73491 1.73417 1.74499 1.79180 



Type numbers and hd values in parentheses are 1947 descriptions of EK glasses for 

 which expansion data appear in Table 550. 



Part 2. — Dispersion of glasses 



Index 



n D 1.69680 1.73400 1.74500 1.74450 



(1.6973) (1.7442) 



_ n D — 1 56.15 51.18 46.42 45.56 



nr — nc (56.0) (45.8) 



tiF-nc 01241 .01434 .01605 .01634 



(.01246) (.01624) 



uf-hd 00874 .01013 .01138 .01157 



(.00877) (.01153) 



n, — n, 00673 .00788 .00900 .00911 



(.00677) (.00913) 



n h -n g 00559 .00660 .00763 .00770 



(.00562) (.00776) 



tiD — n*' 00803 .00916 .01009 .01033 



(.00806) (.01018) 



1.75510 

 (1.7555) 

 47.19 

 (47.2) 

 .01600 

 (.01602) 

 .01133 

 (.01133) 

 .00889 

 (.00890) 

 .00748 

 (.00750) 

 .01011 

 (.01014) 



1.80370 

 (1.8016) 

 41.8 

 (40.9) 

 .01924 

 (.01959) 

 .01368 

 (.01394) 

 .01094 

 (.01118) 

 .00935 

 (.00959) 

 .01190 

 (.0 ) 



TABLE 526.— TRANSMISSION OF OPTICAL GLASS 



Thickness 10 mm, reflection deducted * 



* Abbreviated from a list of results of measurements on freshly polished samples of Bausch & Lomb glasses. 

 Data supplied by the Bausch & Lomb Optical Co. 



SMITHSONIAN PHYSICAL TABLES 



