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In a diffraction pattern due to a single slit of width a with incident light of wavelength $\lambda$ at an angle of diffraction $\theta$, the condition for the first minimum is

• A
  $\lambda \sin \theta=a$
  
• B
  $a \cos \theta=\lambda$
  
• ✓
  $a \sin \theta=\lambda$
  
• D
  $\lambda \cos \theta=a$.