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  4. In young's double slit experiment, the phase difference between the light waves reaching third bright fringe from the central fringe will be (λ=6000 mathringA)

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Q. In young's double slit experiment, the phase difference between the light waves reaching third bright fringe from the central fringe will be $(\lambda=6000\,\mathring{A})$

Wave Optics

Solution:

The phase difference between the light waves reaching the third bright fringe from the central bright fringe will be $\Delta \phi=2 n \pi$
$n =3$
$\Delta \phi=2 \times 3 \times \pi=6 \pi$ (case of constructive interference)