Light of wavelength $\lambda$ is incident on a single slit of width $a$ and the distance between the slit and the screen is $D$. In the diffraction pattern, if the slit width is equal to the width of the central maximum, then $D$ is equal to:
- A$a^2/\lambda$
- B$2\lambda/a$
- C$a^2/2\lambda$
- D$\lambda/a$
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