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For the Fabry-Perot etalon of thickness ...

For the Fabry-Perot etalon of thickness `d = 2.5 cm` find:
(a) the highest order of interference of light with wavelength `lambda = 0.50 mu m`,
(b) the dispersion region `Delta lambda`, i.e the spectral interval of wavelengths, within which there is still no overlap with orders of interference if the observation is carried out appoximately at wavelength `lambda = 0.50 mu m`.

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