$X$-rays of wavelength $\lambda$ are reflected from parallel planes of atoms in a crystal with spacing $d$ between two planes, as shown in the figure. If the two reflected beams interfere constructively, then the condition for maxima will be (where $n$ is the order of the interference fringe):
- A$d \tan \theta = n \lambda$
- B$d \sin \theta = n \lambda$
- C$2 d \cos \theta = n \lambda$
- D$2 d \sin \theta = n \lambda$
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