what is the formula to find coherence Length.?
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lc = λ2/(2πΔλ) = λf/(2πΔf) = c/Δω, tc = 1/Δω. If we know the wavelength or frequency spread of a light source, we can calculate lc and tc. We cannot observe interference patterns produced by division of amplitude, such as thin-film interference, if the optical path difference greatly exceeds lc.
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