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  4. In Fraunhoffer diffraction, at the angular position of first diffraction minimum, phase difference (in radian) between wavelets from opposite edges of the slit is

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Q. In Fraunhoffer diffraction, at the angular position of first diffraction minimum, phase difference (in radian) between wavelets from opposite edges of the slit is

Wave Optics

Solution:

For minima in diffraction $\Delta x=m \lambda$
For first minima $\Delta x=\lambda$
$\Delta \phi=2 \pi$