State the cause of dispersion, when white light enters a glass prism. Explain with a diagram.
State the cause of dispersion, when white light enters a glass prism. Explain with a diagram.
Solution
When white light passes through a prism it splits into its constituent colours, because each coloured light has different speed in prism. Prism has different refractive index for these light rays and so deviates through different angles when emerge out from the prism. Deviation for violet colour (shortest wavelength) is most and for red colour (largest wavelength) deviation is least.
