How far apart must the slits be to produce a 2nd order dark fringe at an angle of 1 830 when struck by light with a wavelength

Question

How far apart must the slits be to produce a 2nd order dark fringe at an angle of 1 830 when struck by light with a wavelength of 6 70x107m 4 20x10 5m 9 15x10 7m 7 32x10 7m 000

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