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 :-

1. A. 1.2 cm
2. B. 1.2 mm
3. C. 2.4 cm
4. D. 2.4 mm

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