b) A Fabry-Perot device contains two parallel part-reflective surfaces, each with a power re-flection coefficient R = 0.92, separated by an air gap of 40 μm. The device is used at a smallbut non-zero angle of incidence, such that there is a transmission maximum at wavelength589 nm.Calculate the coefficient of finesse, and the resolving power.If a sodium lamp emits 2 spectral lines at 589.0 and 589.6 nm respectively, comment onwhether these two lines can be resolved by the device.

Given that :Reflection coefficient ,air gap ,Wavelength .

Answered: b) A Fabry-Perot device contains two…

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