p37 068

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68. Employing Eq. 37-3, we find (with m = 3 and all lengths in µm)

θ = sin

1

a

= sin

1

(3)(0.5)

2

which yields θ = 48.6

. Now, we use the experimental geometry (tan θ = y/D where y locates the

minimum relative to the middle of the pattern) to find

y = D tan θ = 2.27 m .


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