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
    $(2n - 1)\frac{\lambda}{2}$
  • C
    $n\lambda$
  • D
    $(2n + 1)\frac{\lambda}{2}$

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