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Two monochromatic light beams of intensity 16 and 9 units are interfacing .The ratio of intensities of bright and dark parts of the resultant pattern is :

$(a)\;\large\frac{16}{9} \qquad(b)\;\large\frac{4}{3}\qquad(c)\;\large\frac{7}{1}\qquad(d)\;\large\frac{49}{1}$

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