Splitting of white light into seven constituent colours when passed through the prism. Prism is an optical element which is transparent with flat, polished surfaces that refract light. Change in the direction of propagation of light when passed through a different medium is called refraction of light.

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A light prism is a transparent optical element with flat, polished surfaces that refract, or bend, light.

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Rainbow, aren’t they beautiful? Have you ever wondered how a rainbow is created? It is a simple physical phenomenon called dispersion of light. So, what is the dispersion of light?

When light travels from one medium to another, the speed of its propagation changes, as a result, it ‘bends’ or is ‘refracted’. Now when light passes through a prism, it is refracted towards the base of the triangle. The refraction of light through the prism is well illustrated in the diagram given above.

When white light is passed through a glass prism it splits into its spectrum of colours (in order violet, indigo, blue, green, yellow, orange and red) and this process of white light splitting into its constituent colours is termed as dispersion. The simplest way to explain dispersion is through dispersion in the prism.

Actually, light does disperse into its spectrum of colours in a glass slab as well. We can see this if we observe it in a particular way. Before we proceed you should know something about refractive indices. They aren’t constant. They vary with the frequency of light and hence the wavelength.

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Newton was the first to conduct this experiment on passing light through a prism. He let sunlight pass through the prism expecting to see the white light on the screen placed at the other side but instead, he saw the spectrum of light after dispersion. He had a small hunch regarding the significance here but decided to do something else here to confirm it.

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Hope you have understood what is the dispersion of light? If you wish to learn more physics concepts with the help of interactive video lessons, download BYJU’S – The Learning App.

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