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 :

Question

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