Possible wavelengths when a minimum falls exactly in front of one slit

1. A.
   $\frac{1}{D},\frac{1}{5D},\frac{1}{7D}$,
2. B.
   $\frac{1}{D},\frac{1}{3D},\frac{1}{5D}$,
3. C.
   $\frac{1}{D},\frac{1}{2D},\frac{1}{3D}$,
4. D.
   $\frac{1}{D^{2}},\frac{1}{2D^{2}},\frac{1}{3D^{2}}$,

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1. A.
   $D, 2D, 3D, \ldots$
2. B.
   $D, 3D, 5D, \ldots$
3. C.
   $\dfrac{1}{D}, \dfrac{2}{D}, \dfrac{3}{D}, \ldots$
4. D.
   $\dfrac{1}{D^2}, \dfrac{2}{D^2}, \dfrac{3}{D^2}, \ldots$

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