Bragg's law is given by the which of the following equation?

• A

  $\mathrm{n} \lambda=2 \theta \sin \theta$
• Correct answer
  B

  $\mathrm{n} \lambda=2 \mathrm{~d} \sin \theta$
• C

  $2 \mathrm{n} \lambda=\mathrm{d} \sin \theta$
• D

  $\mathrm{n} \frac{\theta}{2}=\frac{\mathrm{d}}{2} \sin \theta$

Hence, the correct answer is option: 'B'.