Two narrow and parallel slits 0.08 cm apart are illuminated by a light of frequency 6 X 1011 kHz. At what distance from the slits should the screen be placed to obtain fringe width of 0.6 mm?

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Two narrow and parallel slits 0.08 cm apart are illuminated by a light of frequency 6 X 10<sup>11</sup> kHz. At what distance from the slits should the screen be placed to obtain fringe width of 0.6 mm?