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Monochromatic light of a wavelength 650 ...

Monochromatic light of a wavelength `650` nm falls normally on a slit of width `13xx10^(-4)` cm and the resulting Fraunhofer diffraction is obtained on a screen. Find the angular width of the central maxima.

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Apply Fraunhofer diffraction condition for central maxima, then find `2theta` .
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