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In a Young's experiment, two coherent sources are placed 0.90 mm apart and the fringes are observed one metre away. If it produces the second dark fringe at a distance of 1 mm from the central fringe, the wavelength of monochromatic light used would be

1. cm 4 10 60  
2. cm 4 10 10  
3. cm 5 10 10  
4. cm 5 10 6  

Correct answer: cm 5 10 6  

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