In a two-beam interferometer the orange mercury line composed of two wavelengths \( \lambda_{1}=...

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In a two-beam interferometer the orange mercury line composed of two wavelengths \( \lambda_{1}=576.97 \mathrm{~nm} \) and \( \lambda_{2}=579.03 \mathrm{~nm} \) is employed. What is the least order of interference at which the sharpness of the fringe pattern is the worst?
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