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−< <
+
λ
λ
λ
a
m
da
.
Rewriting this as
−<
<
+
da m da
//
we arrive at the result
md
a
m
max
/
<
≤+
1. Due to
the symmetry of the pattern, the multiplicity of the
m
values is 2
m
max
+ 1 = 17 so that
m
max
= 8, and the result becomes
89
<≤
d
a
where these numbers are as accurate as the experiment allows (that is, “9” means “9.000”
if our measurements are that good).
80. The central diffraction envelope spans the range
−
<<
+
θ
11
where
1
1
sin ( / ).
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics, Diffraction

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