define dispersion,atmospheric refraction and tyndal effect
Answers
The spreading is due to the fact that the index of refraction of the glass depends on the wavelength of the light. ... This dependence of the refractive index on wavelength (or frequency) is called dispersion, and is the source of several beautiful atmospheric colour phenomena.
Dispersion
Dispersion is a statistical term that describes the size of the distribution of values expected for a particular variable. Dispersion can be measured by several different statistics, such as range, variance, and standard deviation. In finance and investing, dispersion usually refers to the range of possible returns on an investment, but it can also be used to measure the risk inherent in a particular security or investment portfolio. It is often interpreted as a measure of the degree of uncertainty, and thus, risk, associated with a particular security or investment portfolio.
Atmospheric Refraction
The refraction of light by the Earth’s atmosphere is known as atmospheric refraction. The earth’s atmosphere is not evenly distributed and is optically denser at the bottom while is rarer at the top. The velocity of light changes from layer to layer. The molecules of different gases and dust particles have different optical densities.When an object transmits light rays in the atmosphere, these light rays pass through the atmosphere having different air layers of different densities and get refracted by the atmosphere.
Tyndall Effect
The Tyndall effect is the phenomenon in which the particles in a colloid scatter the beams of light that are directed at them. This effect is exhibited by all colloidal solutions and some very fine suspensions. Therefore, it can be used to verify if a given solution is a colloid. The intensity of scattered light depends on the density of the colloidal particles as well as the frequency of the incident light.
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