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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 37-6 (which is in the textbook
supplement), we have 2(1.22λ/d) = D/L. Therefore,
(1.22)(500 × 10−9 m)(3.54 × 105 m)
= 0.047 m .
9.1 m ...
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