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CBSE - X
Dispersion and Scattering of Light
Dispersion And Scattering Of Light
When a light ray enters one refracting surface of the prism, it bends towards the normal and when it emerges out of the other refracting surface it bends away from the normal.Rainbow is the natural phenomenon in which dispersion takes place. The cause of dispersion is that sun light consists of seven constituents (colours namely violet, indigo, blue, green, yellow, orange and red popularly referred to as VIBGYOR) that have different refractive index with respect to a medium. The wavelength of each colour is different that causes the difference in velocity of the corresponding light when passing from one medium to another.
This phenomenon can be observed in a lab environment using a triangular glass prism. It is a solid structure having three rectangular and two triangular surfaces. Any two rectangular faces are the refracting surfaces and the third one is the base. The angle between the refracting surfaces is the angle of the prism or refracting angle. The edge formed by the two refracting surfaces is the refracting edge. When a light ray enters one refracting surface of the prism, it bends towards the normal and when it emerges out of the other refracting surface it bends away from the normal. The angle between the incident ray and the emergent ray is the angle of deviation.
Another important natural phenomenon where we encounter atmospheric refraction is scattering of light. Tyndall effect explains the scattering of light by colloidal particles in a medium.
