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23. Let the distance in question be
x
. The path difference (between rays originating from
S
1
and
S
2
and arriving at points on the
x
> 0 axis) is
dxxm
22
1
2
+−
=
+
F
H
G
I
K
J
λ,
where we are requiring destructive interference (halfinteger wavelength phase
differences) and
0,1, 2,
.
m
=
"
After some algebraic steps, we solve for the distance in
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 Spring '08
 Any
 Physics

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