Abeam of light polarized in the x-direction is travelling in the z-direction. it passes through a polarizer and reaches an analyzer. the polarization axis of the analyzer can only be rotated in the x-y plane. it is found that the intensity is 3 times smaller when the polarization axis of the analyzer is in the y direction as compare to that in the x-direction the angle between the polarization axis of the polarizer and the x axis is (а) 30° (b) 45° (с) 60° (d) 90°