An optical fiber carrying a beam of infrared laser light witha power of 1.5 mW and a cross-sectional diameter of 1.2mm is placedagainst the skull. Some of the light enters the brain, where itscatters from hemoglobin and is picked up by a detector. a)According to Beer-Lambert Law, I (intensity) decreases withpenetration distance, d, I = Ioe-ud, u = 4.7cm-1. a) Find the intensity of the laser afterit penetrates through 3 cm of tissue. b) Find the electric field ofthe initial light beam.