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For a single slit of width a, the first diffraction maximum with light of wavelength $\lambda$ subtends an angle $\theta$ such that $\sin \theta$ is equal to

• A
  $\frac{\lambda}{2 a}$
  
• B
  $\frac{\lambda}{a}$
  
• ✓
  $\frac{1.5 \lambda}{a}$
  
• D
  $\frac{2 \lambda}{a}$.