Explain What is Wave Normal

The direction of propagation is defined as the axis along with the wave travels. It is also regarded as a disturbance in the energy level of a field. The different waves are derived from various laws given by Snell.  The direction of a wave also propagates the direction in which the wave transverse. It is completely based on the different theories and the concepts of Snell. The ray of light refers to the line that is perpendicular to the wavefront.  The direction of propagation and the electromagnetic wave are directly related to each other.

Explanation on the direction of the propagation

The direction of propagation refers to the electromagnetic wave that is always perpendicular to the plane. The electromagnetic wave is made of a magnetic field and oscillating electric. The electromagnetic wave does not require a medium to travel from one place to another. The electromagnetic wave always has electric and magnetic fields which are completely perpendicular to each other. The direction of propagation is also considered as the direction of E×B. The electromagnetic wave is always the transversal wave and it has also a direct relation with the concept of wave normal. 

There are also different factors on which the direction of propagation completely depends on. However, the key factors related to the direction of propagation include wave length and the source of the motion. 

Relationship between ray of light and wave normal

The ray of light refers to the line that is perpendicular to the wave length. However, its tangent is collinear to the wave vector. The direction of the ray along with the light energy travels in a medium is also called the ray of light. It is also represented as a straight line with an arrow mark associated with it. There is also a difference between the ray of light and the beam of light. The ideas and the concepts of the light are completely based on the theories of Snell. There are different factors on which the ideas, as well as the concepts of the rays of lights, depend on. The key factors that are related to the rays of light include the angle of incidence, wavelength and thickness of the rectangular slab. 

Differences between the surface of wavefront and wave normal

The surface of a wavefront is defined as the locus of a point represented by the propagation of position of the same phase. It also represents the perpendicular line drawn to the surface of the wavefront. The wave normal always acts as normal on the wavefront. The modern physicists as well as the learners always put more importance on the concepts of the wavelength and the wave normal to understand the key concepts of the direction of propagation. On the other hand, the wavefront is also defined as a surface that connects the same point on an adjacent level. The wavefront also changes its shapes for the different types of lenses and mirrors. The wave normal and the rays of light are always perpendicular to the wavefront and wave normal in the isotropic medium. 

Conclusion

From the above discussions, it can also be concluded that the direction of propagation is defined as the axis along with the wave travels. There are some different factors on which the direction of propagation is completely based. The key factors that are related to the direction of propagation include the perpendicular plane related to the electromagnetic wave and the wave normal. The key concepts as well as the ideas related to the rays of light are completely based on the theories and the concepts of Snell. The differences between the wavefront and the wave normal lie in the surfaces that connect the same point.