For a parallel beam of monochromatic light of wavelength λ , diffraction is produced by a single slit whose…

1. $\frac{2\mathrm{D}\mathrm{\lambda }}{\mathrm{a}}$
2. $\frac{\mathrm{D}\mathrm{\lambda }}{\mathrm{a}}$
3. $\frac{\mathrm{D}\mathrm{a}}{\mathrm{\lambda }}$
4. $\frac{2\mathrm{D}\mathrm{a}}{\mathrm{\lambda }}$

Solution

Linear width of central maximum.
$D \left(2\theta \right)=2D\theta =\frac{2D\lambda }{a}$

Asked in: NEET 2015 (Phase 1)

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