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in Physics by (75.3k points)

In a two-beam interferometer the orange mercury line composed of two wavelengths λ1 = 576.97 nm and λ2 = 579.03 nm is employed. What is the least order of interference at which the sharpness of the fringe pattern is the worst?

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Sharpness of the fringe pattern is the worst when the maxima and minima intermingle:-

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