This essay focuses on a reflection or deeper thought or opinion.. If we covered it, then it is open for a discussion. Must express an opinion or feel about the topic, cannot be a simple summary of a topic The topic already submits as a PDF.

a reflection or deeper thought or opinion

about something said, read, present. If we cover it, then it is open for a discussion. Must express an opinion or feel about the topic, cannot be a simple summary of a topic The topic already submits as a PDF

In classical electrodynamics, light is considered as an electromagnetic wave, which is described by Maxwell’s equations. Light waves incident on a material induce small oscillations of polarisation in the individual atoms (or oscillation of electrons, in metals), causing each particle to radiate a small secondary wave in all directions, like a dipole antenna. All these waves add up to give specular reflection and refraction, according to the Huygens–Fresnel principle.

In the case of dielectrics such as glass, the electric field of the light acts on the electrons. Material, and the moving electrons generate fields and become new radiators. The refract light in the glass is the combination of the forward radiation of the electrons and the incident light. The reflect light is the combination of the backward radiation of all of the electrons.

In metals, electrons with no binding energy are called free electrons. When these electrons oscillate with the incident light, the phase difference between their radiation field and the incident field is π (180°), so the forward radiation cancels the incident light, and backward radiation is just the reflected light.

Light–matter interaction in terms of photons is a topic of quantum electrodynamics, and is described in detail by Richard Feynman in his popular book QED: The Strange Theory of Light and Matter.

Diffuse reflection

When light strikes the surface of a (non-metallic) material it bounces off in all directions. Multiple reflections by the microscopic irregularities inside the material (e.g. the grain boundaries of a polycrystalline material, or the cell or fiber boundaries of an organic material) and by its surface, if it is rough. Thus, an ‘image’ is not form. This is call diffuse reflection. The exact form of the reflection depends on the structure of the material. One common model for diffuse reflection is Lambertian reflectance, in which the light is reflect with equal luminance (in photometry) or radiance (in radiometry) in all directions, as define by Lambert’s cosine law.

The light sent to our eyes by most of the objects. Moreover, See is due to diffuse reflection from their surface .Lastly,  Primary mechanism of physical observation.^[2]

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