On the basis of comparing Maxwell equation for a light wave to Schroedinger equation for a photon, we conclude that the
former solution that must be a real function is the real part of the latter solution that must be a complex function. Using
the state-vector function that is the general solution of Schroedinger equation for a photon, we solve some true but strange
optical problems including the simple demonstration of Malus's Law and the orthogonal decomposition of a natural light.