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31. Eq. 3614 gives the Rayleigh angle (in radians):
1.22
R
D
dL
λ
θ
=
=
where the rationale behind the second equality is given in Sample Problem 363.
(a) We are asked to solve for
D
and are given
λ
= 1.40
×
10
−
9
m,
d
= 0.200
×
10
−
3
m, and
3
2000 10 m
L
=×
.
Consequently, we obtain
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 Spring '08
 Any
 Physics

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