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Two coherent sources have intensities in the ratio 25: 16. Find the ratio of intensities of maxima to minima after the superposition of waves from the two source.

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I1 = a12 = 25, a1 = 5

I2 = a22 = 16

a2 = 4

Maximum intensity Imax = (a+ a2)2 = (5 + 4)2 = 81

Minimum intensity Imin = (5 - 4)2 = 1

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