Two light beams of intensities in the ratio of 9:4 are allowed to interfere. The ratio of the intensity of maxima and minima will be:
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For interference of light, the intensity at maxima is given by \( I_{\text{max}} = (I_1 + I_2 + 2 \sqrt{I_1 I_2}) \), and the intensity at minima is \(I_{\text{min}} = (I_1 + I_2 2 \sqrt{I_1 I_2}) \).