![]() There are some practical examples that we can find around ourselves. The concept of optical density explains what are the influential factors that can change the course of the light and can even lower the speed of the transmitted light. The best way to understand the concept of physics is to take practical examples and analyse them on the basis of the knowledge of a particular topic. The Best Way to Understand the Concept of Optical Density The concept of optical density takes both the phenomenon into account, that is the absorption of the light of a specific wavelength and the amount of light that is scattering. Absorbance measures the capacity of a particular object or a medium to absorb the transmitted light that is of a specific wavelength. Optical density measures the degree of the angle to which a particular medium slows down the speed of the transmitted light. This is an important concept of physics that explains a lot of phenomena involving light emission and transmission.ĭifference between Optical Density and Absorbance The concept of optical density helps students to understand why the speed of light decreases when passing through a particular substance and the importance of the wavelength of the light transmitted through the medium. The concept of optical density helps the students to understand the speed of light transmission. With increased concentration, the optical density of the matter will also increase. Optical density is influenced by the concentration of light due to optical absorption. Due to the slower speed of light, it will bend. If the optical density of the material is higher in value then it will decrease the speed of light and this causes the light to change its motion. Since optical density can influence the speed of light due to optical absorption, it is quite evident that the concentration can also influence the optical density of the matter. How does Concentration Influence Optical Density? Where Φ t is the radiant flux transmitted by that material and, Φ i is the radiant flux received by that material. The absorption unit is basically used in ultraviolet-visible spectroscopy where AU is a dimensionless quantity denoted by AU.Ībsorption of any material is taken as A given by, Therefore, absorption of light occurs more in an optically dense medium. If there is only a fragmental absorption of energy, the medium is said to be lucid to that particular radiation, but, if all the energy is lost, the medium is said to be opaque. It measures the speed of light via a substance which is affected mainly by the wavelength of the given light wave.Ībsorbance, in a wave motion, is the transfer of the energy of a wave to matter as the wave passes via it. Optical density measures the ability of an object to slow or delay the transmission of light. The optical density and absorbance both measure the absorption of light when that light passes through an optical medium however they both are not the same. The Relation Between Optical Density and Absorbance ![]() Where, Io is the intensity of visible light incident upon a small area of the film and It, the intensity of light transmitted by that region.
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