Optical rays (grey arrows) are perpendicular to the wavefronts of an electromagnetic wave (planes) and parallel to the Poynting vector (S).
Fig. 2.2 — From electromagnetic waves to rays
Fig. 2.2 — From electromagnetic waves to rays
Optical rays (grey arrows) are perpendicular to the wavefronts of an electromagnetic wave (planes) and parallel to the Poynting vector (S).
Fig. 2.2 — From electromagnetic waves to rays