Advanced physics papers, and revised questions ANGULAR DISPERSION AND DERVIATION The phenomena of white light splitting up into different colors when passed through the prism is called dispersion of light. Dispersion happens because refractive index of prism is different for different wavelengths. The white light that strikes the prism surface has multiple colors with different wavelengths. As each wavelength has different refractive index, each color deviates differently trained generates group of colors. This phenomenon of splitting up of white light into multiple colors when it is passing through a material like prism is called as dispersion. The deviation of the light ray from the original path depends on the refractive index of the material for a given color. We know that among all the colors readies having a highest wavelength and hence lowest refractive index. As a result among all the colors red deviates least and the violet deviates most. The deviation and ...