>> 11 .

8.

 


11

62.

, , υ1 > υ2 , , (. (8.4)) n > 1. α > β (. 8.10): .

(. 8.11), :

, α < β, . . . α β , α. , β 90, (. 8.12). β = 90 α0.

α > α0 . , . .

. , (. 8.13). . . . , (. (8.4)).

, , ( , ) , () . , 90. , , (. . 8.12), 100%. , α0. , , . . .

α0, 90, . sin β = 1 (8.8)

α0. (n = 1,33) 4835', (n = 1,5) 4151', (n = 2,42) 2440'. .

. . , , , .

. , , , .

( ) (. 8.14). . - (. 8.15). , , .

(7.6) , , , . 105106 . , .

           (  )

. .


, . . .


1. ?

2. , ?

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