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• Topic:

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For constructive interference to take place between two monochromatic light waves of wavelength λ, the path difference should be

(1) $\left(2n-1\right)\frac{\lambda }{4}$

(2) $\left(2n-1\right)\frac{\lambda }{2}$

(3) $n\lambda$

(d) $\left(2n+1\right)\frac{\lambda }{2}$