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InterviewSolution
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Which of the following is the formula for calculating coherence time?(a) Τc = \(\frac {\lambda^3}{(c\Delta \lambda)}\)(b) Τc = \(\frac {\lambda}{(c\Delta \lambda)}\)(c) Τc = \(\frac {\lambda^2}{(c\Delta \lambda)}\)(d) Τc = \(\frac {\lambda^2}{(c\Delta \lambda)}\)This question was addressed to me in an internship interview.Enquiry is from Coherent and Incoherent Addition of Waves topic in portion Wave Optics of Physics – Class 12 |
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Answer» RIGHT answer is (d) Τc = \(\frac {\lambda^2}{(c\Delta \lambda)}\) EASIEST explanation: The formula for calculating coherence TIME is given as: Τc = \(\frac {\lambda^2}{(c\Delta \lambda)}\) Where Τc is the coherence time, λ is the WAVELENGTH, ∆λ is the spectral width of the SOURCE, and c is the speed of light in a vacuum (i.e. 3 × 10^8 m/s). |
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