Question: Explain the principle and working of fabry perot interferometer?
The Fabry-Perot Interferometer (FPI) works on the principle of multiple-beam interference, utilizing two parallel, partially reflective mirrors to create an optical cavity. When light enters, it undergoes multiple reflections, leading to constructive and destructive interference based on wavelength. This results in distinct transmission peaks, allowing precise spectral analysis. By adjusting mirror spacing or incidence angles, scientists can resolve fine spectral details. The FPI is widely used in spectroscopy, fiber optics, and laser tuning due to its ability to distinguish closely spaced spectral lines with high precision.
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