$A$ slit of size '$a$' is illuminated by a parallel beam of light of wavelength $\lambda$. The angle at which this light is diffracted is approximately . . . . . . .
- A$\frac{\lambda}{a^{2}}$
- B$\frac{\lambda}{a}$
- C$\frac{a^{2}}{\lambda}$
- D$\frac{a}{\lambda}$
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