Spectroscopy studies the absorption and emission of light by the matter. The wavelength of the radiation is on what the absorption and emission of light depends. Also included in this are interactions between primary units such as ions, atoms, electrons etc. Collision energy also has its bases in relative theory, electrodynamics and quantum mechanics. The transmission of light or some other electromagnetic radiations through matter will be discussed in this post. This is termed as optical density.
The mediums atom’s that the beam of light interacts with absorbs it. This property depends on several factors such as the width and density of the medium to which the absorbing atom belongs.
Optical Density Definition:
“The optical density of a material is a logarithmic ratio of the falling radiation to the transmitted radiation through a material. It is also referred as a fraction of absorbed radiation at a particular wavelength.”
The medium’s property is a factor that affects the speed of the light being transmitted. In a similar manner, the electromagnetic wave’s speed through a medium is also dependent on the density of the medium. There is not much common in between the general physical density and the optical density, while the physical density is the ratio of mass upon volume, optical density is used to describe the absorption tendencies of the atom constituting the medium. Before new electromagnetic disturbances are remitted the slothful tendencies of the medium display the maintenance of the energy that’s been absorbed. It can be seen as the vibration of electrons. The wave’s movement through a material is lowered the higher the value of optical density will be.
A light wave or electromagnetic wave is produced with the help of electric charges that vibrate. The wave travels with the speed of 3 x 108 m/s in complete vacuum of space. The electron inside the atoms of the medium move in a vibrating fashion when the wave passes through them. If the frequency of the wave does not resonate with the medium, the energy is passed on. The remitted wave is also an electromagnetic wave with the same frequency and speed as before.
The value of the index of refraction indicates what the optical density of the medium is going to be. The more times slower the light wave is the value of the index of refraction will be dependent on it. Different mediums have varied index’s of refraction. The optical density increases with the increase in the index of refraction which causes a decrease in the speed of light. Thus the index of refraction value
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