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  4. Fraunhofer diffraction pattern is observed at a distance of 2 m on screen, when a plane wavefront of 6000 mathringA is incident prependicularly on 0.2 mm wide slit. Width (in mm) of central maxima is ?

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Q. Fraunhofer diffraction pattern is observed at a distance of $2\, m$ on screen, when a plane wavefront of $6000\, \mathring{A}$ is incident prependicularly on $0.2\, mm$ wide slit. Width (in $mm$) of central maxima is ?

Wave Optics

Solution:

$w=\frac{2 f \lambda}{a}=12\, mm$