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Dispersion of light

December 09, 2012  by: kanduri narasimha  Points: 12   Category: General Science  Earning $0.20   Views: 1030

In this article, what changes will be seen in white light when it passing through the prism is explained.

         

Generally, we know that when light passing from one medium to another medium, it undergoes some changes. Some part of the light is reflected back in the same medium, some part of it absorbed by second medium and remaining part is refracted in second medium. In addition to this properties, there is another property of light. That is dispersion.

Definition of dispersion:


When white or visible light passing through a prism then we can observe different colours on the screen instead of white or visible light.

Optical density is the principle involved in dispersion of light.


Above figure shows that dispersion of white or visible light when it passing through the prism. When white light is passing through red light bends less while violet light bends more. As red light has longer wavelength, so it bends less when comparing with that of violet light because violet light has shorter wavelength. Due to dispersion of light, different colours of light emerge showing variation



Above figure shows that when white light passing through two prisms again white light emerges.

Example for dispersion of light is Rainbow. When rain stops, we can see VIBGYOR, that is Rainbow in the sky. Moisture in the atmosphere acts as prisms.

Angular dispersion:


Angular dispersion is nothing but as the difference of the angles of deviations of the two colours. Angular dispersion depends upon the angle of prism and the difference between the refractive indices for two colours.

Dispersive power:


Dispersive power of the material of a prism is the ratio of the angular dispersion of two colours to their mean position.




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