For a parallel beam of monochromatic light of wavelength $\lambda$,diffraction is produced by a single slit whose width $a$ is of the order of the wavelength of the light. If $D$ is the distance of the screen from the slit,the width of the central maxima will be
- A$\frac{2D\lambda}{a}$
- B$\frac{D\lambda}{a}$
- C$\frac{Da}{\lambda}$
- D$\frac{2Da}{\lambda}$
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