Alex's monochromator makes quasi-monochromatic light using the tungsten lamp. The liner dispersion of the monochromator is 20 Å/mm and the exit slit is set to 200 µm. The monochromator is set to output light at 500 nm. a) What is the coherence time of the light from the output? b) What is the coherence length of the light from the output? c) How do these values change with wavelength? If Alex wanted to maximize the coherence time what should they change in the setup?

Alex's monochromator makes quasi-monochromatic light using the tungsten lamp. The liner dispersion of the monochromator is 20 Å/mm and the exit slit is set to 200 µm. The monochromator is set to output light at 500 nm. a) What is the coherence time of the light from the output? b) What is the coherence length of the light from the output? c) How do these values change with wavelength? If Alex wanted to maximize the coherence time what should they change in the setup?