As white light passes through a prism, the red (longer)wavelengths bend less than the blue(shorter)wavelengths, so forming the rainbow of colors.

Question

Quizplus · Accepted Answer

This is the principle of dispersion which causes the separation of colors in a spectrum. This is because the angle of refraction is dependent on the wavelength of light, with longer wavelengths bending less than shorter wavelengths. This dispersion of light helps to separate white light into its component colors.

As White Light Passes Through a Prism, the Red (Longer)wavelengths