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  4. Two coherent sources of intensity 9: 4 produce interference. What is ratio of maxima and minima in interference pattern produced by them?

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Q. Two coherent sources of intensity $9: 4$ produce interference. What is ratio of maxima and minima in interference pattern produced by them?

Solution:

$\frac{A_{1}}{A_{2}}=\sqrt{\frac{l_{1}}{I_{2}}}=\frac{3}{2}$
$\frac{I_{\max }}{I_{\min }}=\left(\frac{3 x+2 x}{3 x-2 x}\right)^{2}=\left(\frac{5}{1}\right)^{2}=\frac{25}{1}$