Three polarizing plates whose planes are parallel are centered on a common axis. The directions of the

Question:

Three polarizing plates whose planes are parallel are centered on a common axis. The directions of the transmission axes relative to the common vertical direction are shown in Figure. A linearly polarized beam of light with plane of polarization parallel to the vertical reference direction is incident from the left onto the first disk with intensity Ii = 10.0 units (arbitrary). Calculate the transmitted intensity If when θ1 = 20.0?, θ2 = 40.0?, and θ3 =60.0?.