p37 058

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58. The angle of incidence on the reflection planes is θ = 63.8

45.0

= 18.8

, and the plane-plane separation

is d = a

0

/

2. Thus, using 2d sin θ = λ, we get

a

0

=

2d =

2λ

2 sin θ

=

0.260 nm

2 sin 18.8

= 0.570 nm .


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