This lecture presents an exercise involving circularly polarized light passing through a quarter-wave plate and a polarizer with a variable angle, aiming to determine the maximum intensity that can be transmitted in this setup. By analyzing the addition of a phase term and the effect of the components' orientation, it is shown that the polarizer's angle relative to the default polarization axis determines the intensity transmission, which remains at its maximum value of 1 due to the quarter-wave plate's characteristics.