The diffraction pattern of an NaCl crystal is measured with 154-nm light from a copper source.Constructive interference is seen at 2$\theta$ = 22.4$\degree$.What is the minimum spacing between layers giving rise to this pattern?

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The Answer of The diffraction pattern of an NaCl crystal is measured with 154-nm light from a copper source.Constructive interference is seen at 2$\theta$ = 22.4$\degree$.What is the minimum spacing between layers giving rise to this pattern?

The Diffraction Pattern of an NaCl Crystal Is Measured with 154-Nm