. , , , (. 272, ; ). , ( ) . (, , ) . , - , . , - ( !) (. 272, ), . , (, , ) , (. 272, ), ( ).
, , . , ( ) , , , . ( j, p), , ( j = p /2 ), ( ) .
Imax, Imin , . Imax = Imin = 0, Imin =0 = 1.
(, ), , . (, ), , : ( !). , , ( . 275 ), , ( ).
( ( ) ) . . (17811868) , i B ( ),
|
|
(n 21 ), ( , ) (. 276). i B , . , (tg i B = sin i B/cos i B, n 21 = sin i B / sin i 2(i 2 ), cos i B=sin i 2). , i B + i 2 = p /2, i B = i B ( ), i B + i 2 = p /2