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Interferometry Fabry-Perot

3) A Fabry-Perot interferometer with fixed plate spacing t = 1.50mm is used to examine filtered light from a helium lamp, with wavelength lambda = 587.56nm. The plates have reflectance R = 0.950.

a) What is the free spectral range (in nm) for this spacing t and wavelength lambda?

b) What is the smallest resolvable wavelength difference for this setup?

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This solution provides explanation of how to find the free spectral range, and what the smallest resolvable wavelength is.