Input I l beam Output beam Mirror L1 Beam splitter Delay Mirror Assume that you have a well-balanced Michelson interferometer. The input beam is not monochromatic- instead the input spectrum is a Gaussian function in wavelength centered around ? = 600 nm with a full-width half-maximum (FWHM) of 10 nm. (a) (1 pt) write down the coherence time ? and coherence length lc of the input light. (b) (7 pts) Plot the irradiance of the output beam as a function -L2 -L1 for between 0 and 3lc. Explain your result in words. Input I l beam Output beam Mirror L1 Beam splitter Delay Mirror Assume that you have a well-balanced Michelson interferometer. The input beam is not monochromatic- instead the input spectrum is a Gaussian function in wavelength centered around ? = 600 nm with a full-width half-maximum (FWHM) of 10 nm. (a) (1 pt) write down the coherence time ? and coherence length lc of the input light. (b) (7 pts) Plot the irradiance of the output beam as a function -L2 -L1 for between 0 and 3lc. Explain your result in words