Question
Bragg’s law for $X-$ rays is
✓
Answer
(b) Suppose, and X-ray bean is incident on a solid, making an angle $\theta$ with the planes of the atoms. These $\mathrm{X}$ -rays are diffracted by different atoms and the diffracted rays interfere. In certain directions, the interference is constructive and we obtain strong reflected $X$ -rays. The analysis shows that there will be a strong reflected $x$ -ray beam only if $2 d \sin \theta=n \lambda$
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