its Circular Components in the Faralay "JEjfect" 471 



whence we have 



, 01 x 1*9 x 2 x 1(V x 6 x 10- 5 x 3 



= •05; 



■ 3-U> 



2 x 1-9x3-14 

 approximately. 



Assuming a resolution of 3 7/ for an aperture of 3 centim. 

 the resolution of the image into a triplet, the outer bauds of 

 which would be oppositely circularly polarized, could be just 

 effected. The glass actually used was nj> = l'7'2 and co = '0d1 / 

 and H < 10*, so that the resolution was impossible with the 

 constants used. 



In the experiments with the rectangular prism (fig. 2), with 

 which the resolution was finally obtained, we have 



f=45°, H = 8700, n D = 1-903, ro D =0'l r , \ D = 6xl0~ 5 ; 



xl 



* 0-lxS7xl0 2 xf)Xl0 



i-y x 3-11 



= •008 



Fio-. 4. 



approximately 



'i - e 



For twenty reflexions, 



8r = -52"x20 = 10 r -4 = -000048xlO // -l = -0005 

 approximately in absolute angular units. 



Consider now in fig. 4 a ray a of natural homogeneous 



