Explanation
Four light sources produce the following four waves :(I) y_1 \, = \, a' \, \sin \,(\omega t \, + \,\phi_1)(ii) y_2 \, = \, a' \, \sin \,(2 \omega t)(iii) y_3 \, = \, a' \, \sin \,(\omega t \, + \, \phi_2)(iv) y_4 \, = \, a' \, \sin \,(3 \omega t \, + \, \phi)super position of which two waves give rise to interference ?
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