Physics - Wave Optics Question with Solution | TestHub

A linear aperture whose width is$\mathrm{0.02\; cm}$is placed immediately in front of a lens of focal length$\mathrm{60\; cm.}$The aperture is illuminated normally by a parallel beam of wavelength$5\times {10}^{-5}\mathrm{ }\mathrm{c}\mathrm{m}$. The distance of the first dark band of the diffraction pattern from the centre of the screen is