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11. (a) We wish to set Eq. 3511 equal to 1/ 2, since a halfwavelength phase difference
is equivalent to a
π
radians difference. Thus,
L
nn
min
.
.
=
−
=
−
==
λ
2
21
620
145
1550
155
b
g
b
g
nm
.65
m.
µ
(b) Since a phase difference of
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 Spring '08
 Any
 Physics

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