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Q. If the width of the slit in single slit diffraction experiment is doubled, then the central maximum of diffraction pattern becomes

J & K CETJ & K CET 2009Wave Optics

Solution:

As the slit width increase (relative to wavelength) the width of the central diffraction maxima decreases, ie, the light undergoes less flaring by the slit. The secondary maxima also decreases in width (and becomes weaker).