Chapter 11: Human Eye and the Colourful World

VIGYAN

Chapter 11: Human Eye and the Colourful World Class X Science Dispersion of White Light by Glass Prism Dispersion: Splitting of light into its component colours is called dispersion of light. When light is passed through a glass prism, it undergoes dispersion. Spectrum: When white light undergoes dispersion, it splits into seven colours. The band of seven colours obtained is called a spectrum. The seven colours are VIBGYOR : Violet, Indigo, Blue, Green, Yellow, Orange, Red. Cause of Dispersion: When white light passes through a glass prism, different colours of light bend through different angles. Thus the rays of each colour emerge out distinctly. Red light bends the least. Violet light bends the most. Isaac Newton: The scientist who first demonstrated dispersion of white light through a prism. Recombination of Spectrum If a second identical prism is placed in an inverted position with respect to the first prism, all the colours recombine to form w…

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