How would the indices of refrection account for the arrangement of colors of light?

The indices of refraction for different colors of light determine how much each color slows down when passing through a medium. This causes the different colors to bend by different amounts, resulting in the separation of colors that we see in phenomena like rainbows or prisms. Each color has a specific wavelength, which interacts uniquely with the material's refractive index, leading to distinct paths of light.