STUDY OF ORES AND METALS. 



425 



Isotropic, Absorbing Media. — For such substances Mi = W2, 

 K^ = K2. The intensity of the reflected Hght is (equation 22) 



Irs (n — 1)2 + n^K^ 



(37) 



Is {n + i)^ + w^K^" 

 In order to form a clear picture of the relative influence of the 



On^»1 2 3 4 5 6 7 8 9 lO 



Fig. 4. The percentage (ordinates) of normally incident light reflected 

 from a plate of refractive index n (abscissae) and absorption index « (curves) 

 is given in this figure. 



refractive index and the absorption index on the reflecting powder 

 of an anisotropic, absorbing crystal surface, a series of values com- 

 puted by means of equation (37) are listed in Table 6 and are rep- 



