申論題

8. A Fabry-Perot interferometer is assembled by two highly reflecting mirrors with a separation distance of 0.8 cm in air. The mirrors have the amplitude reflection coefficient of r = 0.932. A light source of 6400 wavelength illuminates the Fabry-Perot interferometer.

(d) (4%) What is the minimum spacing between the mirrors of a Fabry-Perot interferometer to resolve two lines with △λ = 0.07 at λ = 5900 ?