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  4. In Young’s double slit experiment interference fringes will be observed on the screen when, the initial phase difference between lights originating from the two coherent sources separated vertically by distance d, is equal to

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Q. In Young’s double slit experiment interference fringes will be observed on the screen when, the initial phase difference between lights originating from the two coherent sources separated vertically by distance $d$, is equal to

UPSEEUPSEE 2011Wave Optics

Solution:

Constructive interference occurs when the phase difference between the waves is an even multiple of $\pi\left(180^{\circ}\right)$, whereas destructive interference occurs when the difference is an odd multiple of $\pi$