w
a
v
e
l
e
n
g
t
h
(
n
m
)
4
0
0
4
5
0
5
0
0
5
5
0
6
0
0
6
5
0
7
0
0
r
e
f
l
e
c
t
a
n
c
e
%
5
0
6
0
7
0
8
0
9
0
a
i
r
t
h
i
c
k
n
e
s
s
(
m
m
)
0
.
1
0
.
1
5
0
.
2
0
.
2
5
0
.
3
f
o
c
a
l
l
e
n
g
t
h
(
c
m
)
3
0
4
0
5
0