Phase difference of the interfering waves for the nth dark fringe

1. A.
   zero
2. B.
   $(4n+1)\frac{\pi}{2}$
3. C.
   $(2n-1)\pi$
4. D.
   $(2n+1)\frac{\pi}{2}$

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1. A.
   $n\frac{\pi}{2}$
2. B.
   $(2n + 1)\pi$
3. C.
   $\ (2n - 1)\pi$
4. D.
   $\ (2n - 1)\frac{\pi}{2}$

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1. A.
   $n \cdot \dfrac{\pi}{2}$
2. B.
   $(2n + 1)\pi$
3. C.
   $(2n - 1)\pi$
4. D.
   $(2n - 1)\dfrac{\pi}{2}$

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