, . (. 233) , . , . .
1. . S(. 245), S1 S2, S. , S1 S2 .
. 245
( ) (), S1 S2. (. 171), . .
2. . S (.246) 1 2, , 180 ( j). , , , S1 S2( 2j) r ( ).
. 246
, , S1 S2, S .
S1 S2 , , , ( . 246 ). , 2j. (), (3).
3. . , . S(. 247) , , S1 S2, . , ( ) .
. 247
. , , (. 248).
. 248
S1 S2 d ( S - ) . , l, l ≫d. , .
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, , D = s2 s1(. 172). . 248
s22 - s21 = 2xd,
l ≫d , s1 + s2 2 l,
(173.1)
D (173.1) (172.2) (172.3), , ,
(173.2)
- ,
(173.3)
( ), ,
(173.4)
D ( m) l, d l0. (173.4), Dx d; , , d l, . l0 10-7 , , l ≫d ( ). l, d D, (173.4), . (173.2) (173.3) , , , , , . , m = 0, . () (m = 1), (m = 2) . .
, , (l0 = const). , 0,39 ( ) 0,75 ( ), , (173.4), . m = 0 , , , . . ( , ).