In a diffraction pattern due to a single slit of width 'a', the first minimum is observed at an angle 30 when light of wavelength 5000 Å is incident on the slit. The first secondary maximum is observed at an angle of :

1. A. -1 ( 1 4 )
2. B. -1 ( 2 3 )
3. C. -1 ( 1 2 )
4. D. -1 ( 3 4 )

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