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| Home » Plasma Dictionary - O » Opacity |
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| Plasma Dictionary |
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| Plasma Dictionary - Terms Started With Alphabet O |
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Term : Opacity
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Definition : Opacity characterizes the extent to which a ray of light is attenuated while passing through a given material. Light may be absorbed, scattered, and possibly re-emitted. All of these processes can depend on the light's wavelength (or, equivalently, the light's frequency or the energy of its constituent photons). The total attenuation depends on the opacity, the density of the material, and the thickness of the material. The product of the opacity, the density and the thickness is known as the optical depth, tau. The ratio of the transmitted light to the incident light is called the transmission, T. In the simplest case, T = exp(-tau). When tau is much less than unity, the system is said to be optically thin, and the transmission is approximately 1-tau, which is close to 1. When tau is larger than unity, the transmission approaches zero, and the system is said to be optically thick.
A good real-world example is fog: when you can see through the fog, it is optically thin; when you can't, it is optically thick!
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A planet (from the Greek planete means "wanderer" or
more forcefully "vagrant, tramp") is an object in orbit around a star
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A science that deals with the history of the earth as recorded in rocks.
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