An interference is observed due to two coherent sources `S_1` placed at origin and `S_2` placed at `(0, 3lambda, 0)`. Here, lambda is the wavelength of the sources. A detector D is moved along the positive x-axis. Find x-coordinates on the x-axis (excluding `x = 0 and x= oo`) where maximum intensity is observed.

Explanation

At x = 0, path differenceis `3 lambda ` . Hence , third order maxima will be obtained. At `x = infty` , path difference is zero. Hence, zero order maxima is obtained . In between first and second order maxima
will be obtained.
`x = 1.25 lambda and x = 4 lambda`