Problem 81. (20 pts) A Michelson interferometer uses light of wavelength 500 nm. The irradiance of the beam exiting the laser is IL A) What are the possible differences in

the lengths of the arms of the interferometer when the irradiance at the detector is IL/4? iš ILB) What are the possible differences in the lengths of the arms of the interferometer when the irradiance at the detector is 0? C) What are the possible differences in the lengths of the arms of the interferometer when the irradiance at the detector is IL? D) When the irradiance at the detector is IL/4, what is the irradiance of the beam exiting the interferometer and heading back towards the laser?