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# Two coherent sources whose intensity ratio is $64 :1$ produce interference fringes. The ratio of intensities of maxima and minima is :

$\begin {array} {1 1} (1)\;9:7 & \quad (2)\;8:1 \\ (3)\;81:49 & \quad (4)\;81 : 7 \end {array}$

(3) 81 : 49