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A beam of light of 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between first dark fringes on either side of the central bright fringe is
                      
(a) 1.2cm

(b) 1.2mm

(c) 2.4cm

(d) 2.4mm

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