D = (2 k + 1) , k , (4.3.5)
, .. .
1. , , , 3 . 500 . ? ?
: l = 500 = 500×10-9 ,
D = 3 = 3×10-6 .
: Dj, k.
. (4.3.4) :
D = 2 k Þ 3×10-6 = 2 k (500×10-9/2),
k = 6, , .
, (4.3.2) k:
Dj = j2 j1 = 2 kp = 2×6 p = 12 p.
: Dj = 12 p, .
2. , , , 5p. 600 . ? ?
: Dj = 5p,
l = 600 = 600×10-9,
: D, k.
. Dj 5p, p. , , (4.3.1):
Dj = j2 j1 = (2 k + 1) p = 5 p,
k: k = 2.
, (4.3.5) :
D = (2 k + 1) = (2×2 +1)×(600×10-9/2) = 3×10-6 = 3 .
: k = 2, , D = 3 .
, , , . ,
, .
-.
, , . .
, , , .
, :
|
|
tg (j /2) = j / 2, j ¹ 0 (4.3.6)
:
j 1 = 8,99 , j 2 = 15,45 , j 3 = 21,81 .
:
asinj = 2 k , (4.3.7)
N , d ( ) .
, :
dsinj = kl. (4.3.8)
j , k .
l, N,
d = l / N. (4.3.9)
3. , , .
: k 1 = 3,
k 2 = 2,
j 1 = j 2,
: 2/ 1.
. (4.3.7) :
a 1 sin j = 2 k 1 , k 1 = 3, a 1 sin j = 6 ,
a 2 sinj = 2 k 2 , k 2 = 2, a 2 sinj = 4 .
:
2/ 1 = 1/3.
: 1/3.
4. , 7 ?
: = 7 l,
: k.
. :
asinj = (2 k + 1)
, k. , , , ((sinj) = 1):
a (sinj) = (2 k + 1) Þ 7 l = (2 k + 1) ,
14 = 2 k + 1 Þ k = 13/2 = 6 ( ).
: k = 6.
5. 2500 1 , 30. . , 670 ?
: N = 2500,
l = 1 = 0,01 ,
k = 4,
j = 30,
l = 670 = 670×10-9.
:l, k.
. ) , . (4.3.8) , (4.3.9) :
dsinj = kl, d = l / N, Þ (l / N) sinj = kl.
l:
l = (l sinj)/(N k) = 5×10-7 = 500 .
) , , 670 . (4.3.8) (4.3.9), , (. 4):
d (sinj) = kl, (sinj) = 1, d = l / N,
:
k = l /(Nl) = 5,9 = 5.
: l = 500 , k = 5.