In a diffraction pattern due to a single slit of width 'a', the first minimum is observed at an angle \(30^\circ\) when light of wavelength 5000 Å is incident on the slit. The first secondary maximum is observed at an angle of :
Diffraction due to a single slit
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A linear aperture whose width is 0.02 cm is placed immediately in front of a lens of focal length 60 cm. The aperture is illuminated normally by a parallel beam of wavelength \(5\times10^{-5}\) cm. The distance of the first dark band of the diffraction pattern from the centre of the screen is