Q. Constructive interference occurs when the path difference is

रचनात्मक हस्तक्षेप तब होता है जब पथ में अंतर होता है

λ/4

λ/2

3λ/4

Constructive interference happens when the path difference between two waves is an integral multiple of the wavelength, i.e.:

\Delta x = n\lambda,\quad \text{where } n = 0, 1, 2, ...

So, when the path difference is λ, the waves are in phase, and their amplitudes add up to form a bright fringe.

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