$A$ light wave of wavelength $\lambda$ is incident on a slit of width $d$. The resulting diffraction pattern is observed on a screen at a distance $D$. If the linear width of the principal maxima is equal to the width of the slit,then the distance $D$ is:
- A$\frac{d}{\lambda}$
- B$\frac{2 \lambda}{d}$
- C$\frac{d^{2}}{2 \lambda}$
- D$\frac{2 \lambda^{2}}{d}$
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