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Unformatted text preview: 22. Since we are considering the diameter of the central diﬀraction maximum, then we are working with twice
the Rayleigh angle. Using notation similar to that in Sample Problem 376 (which is in the textbook
supplement), we have 2(1.22λ/d) = D/L. Therefore,
d=2 1.22λL
(1.22)(500 × 10−9 m)(3.54 × 105 m)
=2
= 0.047 m .
D
9.1 m ...
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 Fall '08
 SPRUNGER
 Physics, Work

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