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