E
Σ
=
E
10
sin
[
ω
t
−
(
k
x
x
+
k
z
z
)
]
+
E
20
sin
[
ω
t
−
(
−
k
x
x
+
k
z
z
)
]
E
Σ
=
E
10
sin
[
ω
t
−
(
k
x
x
+
k
z
z
)
]
+
E
20
sin
[
ω
t
−
(
−
k
x
x
+
k
z
z
)
]
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