⼘
M
.
.
、
LL
√
<
1
,
7
ndcos θ
/M
1
光程差
相位差
2
.
⼚
可
近□
1
α= V上 t
。
'
>
<t
; C
尕
數據
2
是[
L
:
11 m
:
=
x
( 3
2 ×
=
V
rat
2
=
f
∠=
E
.
=
=
毕
Lp ⼩
)
2
X
只
-
吃
3
104 (s
)
×
× 10
108
=
.
—
3
2
Modcos θ
10
l
2
=
× 11
=
2
.
2
× 10
"
( cm
)
)
Shift
No
2
.
2 ×
10
=
=
5
fringe
observed
.
0 × 10
-
7
0 40
.
shift of the
magritude
required
was
ever