Dark fringe exactly in front of one slit: wavelength, order or slit separation

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.
   1
2. B.
   2
3. C.
   3
4. D.
   4

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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.
   $2\lambda$
2. B.
   $3\lambda$
3. C.
   $4\lambda$
4. D.
   $5\lambda$

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

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

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