Explain dispersion of white light by a glass prism with neat sketch. Also explain Newton’s
experiment of recombination of spectrum of white light.
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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. Refraction Of Light Through Prism is well illustrated in the diagram given above.
The different colours in the spectrum of light have different wavelengths. Therefore, the speed with which they all bend varies depending on this wavelength, where violet bends the most, having the shortest wavelength and red bends the least, having the longest wavelength.
Because of this, the dispersion of white light into its spectrum of colours takes place when refracted through a prism.
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