Two waves of intensity ratio \( 1: 9 \) cross eachother at a point. Calculate the ratio of resul...

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Two waves of intensity ratio \( 1: 9 \) cross eachother at a point. Calculate the ratio of resultant intensities at a point, when \( (a) \) waves are incoherent \( (b) \) waves are coherent and differ in phase by \( 60^{\circ} \)
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