Abstract
Two situations are considered. First, the equation of photon motion in an inhomogeneous optical medium, obtained from the laws of mechanics, is compared with the eikonal equation in optics. The equations are identical provided that the photon momentum in the optical medium changes in such a way that the momentum in the medium where the photon is located at given time exceeds the momentum in free space by a factor n. Second, a plane optical resonator partially filled with an optical medium is considered. It is shown that the momentum in the optical medium increases in direct proportion to the energy density of the light wave, which is proportional to n.
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