Light of wavelength $\lambda$ is incident on a slit of width $a$. The resulting diffraction pattern is observed on a screen placed at a distance $D$. If the linear width of the central maximum is equal to the width of the slit,then $D = $ . . . . . . .
- A$\frac{2 \lambda^{2}}{a}$
- B$\frac{a^{2}}{2 \lambda}$
- C$\frac{a}{\lambda}$
- D$\frac{2 \lambda}{a}$
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