Wavelength when the nth dark fringe falls exactly in front of one slit

1. A.
   $\frac{d^{2}}{D}$
2. B.
   $\frac{d^{2}}{2D}$
3. C.
   $\frac{d^{2}}{3D}$
4. D.
   $\frac{d^{2}}{4D}$

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1. A.
   $\dfrac{D^2}{2d}$
2. B.
   $\dfrac{d^2}{2D}$
3. C.
   $\dfrac{D}{2d}$
4. D.
   $\dfrac{d^2}{D}$

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1. A.
   $\frac{d^{2}}{4D}$
2. B.
   $\frac{d^{2}}{3D}$
3. C.
   $\frac{d^{2}}{2D}$
4. D.
   $\frac{d^{2}}{D}$

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1. A.
   $\dfrac{d^2}{9D}$
2. B.
   $\dfrac{d^2}{11D}$
3. C.
   $\dfrac{d^2}{14D}$
4. D.
   $\dfrac{d^2}{7D}$

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