Question

Write the difference between scattering of light and dispersion of light.​

Answer 1

Answer:

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Answer 2

Dispersion:

It is the phenomenon in which white light splits into its constituent colours. White light contains several constituents that vary in their wavelengths (it contains the light of different colours). Since the wavelengths of these constituents are different, their speeds differ from each other in a medium. Note that their speed in a vacuum is the same. In a material medium, the speed of different wavelengths is different.

So when a beam of white light passes through a medium, the material medium splits the white light into different components. This phenomenon is called dispersion. When white light passes through a prism, it disperses into a band of seven different colours. This band of colours obtained from the dispersion of light is called a spectrum. Dispersion of light in a prism results in the formation of a spectrum.

Scattering of light:

Scattering of light can be defined as the deviation of light rays from their straight trajectory. As light propagates through the atmosphere, it travels in a straight path until comes under obstruction from the gas molecules and dust particles in the atmosphere. The process in which light gets deflected by the tiny particles in the medium through which the light passes is called scattering.

Here the light is not split into its constituent colours. Rather, the incident beam of light just gets redirected after being struck by the atmospheric particles. The blue colour of the sky is due to the scattering of sunlight by the molecules of air. During sunset, sunlight has to travel a greater distance, so shorter wavelengths get scattered off and removed and only red wavelengths reach us.

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