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# If the ratio of maximum and minimum intensities of an interference pattern is 36 : 1, then the ratio of amplitudes of the two interfering waves will be :

$\begin {array} {1 1} (1)\;3 : 7 & \quad (2)\;7 : 4 \\ (3)\;4 : 7 & \quad (4)\;7 : 5 \end {array}$

Ans : (4)
7 : 5