ABSTRACT
Louis de Broglie has the essential result of interpreting the physical optics based on diffraction phenomena without making any reference to the idea of harmonic oscillator and its classical dynamics in order to calculate the intensity of light. This chapter presents an equation, which shows that the density of the light particles classically conceived as material points or localized quanta, is proportional with the intensity of the classical theory of light. The effectively inadequate point of the de Broglie’s argument is in fact only the mathematical expression of his way to conclusions. de Broglie added an important attribute to the very classical notion of a light ray. However, his theory means in fact much more, far and beyond the physical theory of light. The de Broglie’s physical ray allows us to construct an interpretation based on the idea of adiabaticity.
