The distance between two coherent sources is $0.1 \, mm$. The fringe-width on a screen $1.2 \, m$ away from the source is $6.0 \, mm$. The wavelength of light used is $\dots \, \mathring{A}$.

  • A
    $4000$
  • B
    $5000$
  • C
    $6000$
  • D
    $7200$

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