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A narrow slit is illuminated by a parall...

A narrow slit is illuminated by a parallel beam of monochromatic light of wavelength `lambda_(0)` equals to `6000 A^(0)` and the angular width of the central maxima in the resulting diffraction pattern is measured.When the slit is next illuminated by light of wavelength `lambda` ,the angular width decreases to half.Calculate the value of the wavelength `lambda`.

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