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For a single slit of width a, the diffraction pattern minima are located at angles $\theta_m$, where $m$ is a positive, non-zero integer. Which of the following expressions is most correct?

• ✓
  $a \sin \theta_m=m \lambda$
  
• B
  $a \sin \theta_m=\frac{m \lambda}{2}$
  
• C
  $a \sin \theta_m=(2 m+1) \frac{\lambda}{2}$
  
• D
  $a \sin \theta_m=(2 m-1) \frac{\lambda}{2}$