Screen distance at which the width of the single slit central maximum equals the slit width

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

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

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

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

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