MCQ

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For constructive interference to take place between two monochromatic light waves of wavelength $\lambda$, the path difference should be

• A
  $(2n - 1)\frac{\lambda }{4}$
• B
  $(2n - 1)\frac{\lambda }{2}$
• ✓
  $n\lambda $
• D
  $(2n + 1)\frac{\lambda }{2}$