Consider a monochromatic beam of wavelength 6000 Å incident (from am extended source) on a Fabry-Perot etalon with n2 = 1, h = 1 cm and F = 200. Concentric rings are observed on the focal plane of a lens of focal length 20 cm
(a) Calculate the reflectivity of each mirror.
(b) Calculate the radii of the first four bright rings. What will be the corresponding value of m?
(c) Calculate the angular width of each ring where the intensity falls by half and the corresponding FWHM (in mm) of each ring.
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