286 On Polarization of Light by Replecici: 
This formula is equally applicable to a single pencil of polarized 
light of the same intensity as the pencil of partially polarized light. 
In all these cases it expresses the quantity of light realy or appa- 
rently polarized in the plane of reflexion. 
In order to show the quantity of light polarized at different angles 
of incidence, I have computed the following table for common light, 
and suited to glass in which m=1.525. 
PLATE GLASS. - @ 
Inclination of 
Angle of| Angle of |Plane of Polari-|Quantity of Light|Quantity of Po-|Ratio of Po- 
incidence Refraction| zation to Plane | reflected out of | larized Light | larized to 
a. a. of Reflexion. 1000 Rays. Q. Reflected 
@. Light. 
° ° ° / 
0 0| 0 O| 45 0 43.23 0. eae 
10 O| 6 32 43 51 43.39 1.74 | 0.04000 
20° 0:12’ 58° )°"40 1s 43.41 7.22 |0.16618. 
25 (10/16) 5 37 21 43.64 11.6 0.26388 
30 0/19 84} 33 40 44.78 17.25 |0.3853 _ 
35 0/22 6 29.8 46.33 24.37 | 0.5260 
40 0j 24 56 23 41 49.10 . 33.25 |0.6773 
AbAO1O7 Sia, 17 22% 53.66 “44.09 | 0.82167 
50 030°. 9 10 18 61.36 © 57.36 | 0.9360 
56 45] 33 15 0 -0 19.0 79.5 1.000 
60 O/| 34 36 5 Ad 93.31 91.6 0.9628 
65 0} 36 28 | -12 45 124.86 112.7 0.90258 
70) PONS 4 02. 18 32 162.67 129.80 | 0.79794 
76 0) 39 18 26 52 257.26 152.34 |0.59154 
78 0; 39 54 30 44 329.95 © 157.67 | 0.47786 
79 OV 40 4 31 59 _ 3599.27 157.69 | 0.43892 
80 0} 40 13 33 13 391.7 156.6 0.40000 
82 44/40 35 36 22 499.44 | 145.4 +|0.29112 
84 0); 40 42 38 2 560.32 134.93 | 0.2408 
85 0|40 47 | 39 12 * 616.28 123.75 | 0.2008 
86 0; 40 51 40) 22:7)... 076.26 108.67 | 0.16068 
87 0| 40 54 41 32 744.11 89.83 | 0.12072 
88 0/40 574, 42 42 819.9 65.9 0.0804 
89 0/40 58 43 51 904.81 36.32 | 0.04014 
90 0! 40 58 45 0 1000.0 0 0.0000 
As the preceding formula is deduced from principles which have 
been either established by experiment or confirmed by it, it may be 
expected f6 harmonize with the results of observation. At all the 
limits where the pencil is either wholly polarized or not polarized at 
all, it of course corresponds with experiment: but though i in so > far 
