Rain Droplet Dispersing red and violet rays

Red and Violet beams of light from upper left strike a simulated water droplet. The light is refracted and reflected by the droplet. The shorter wavelengths of violet are refracted more, causing a dispersion of the two colours (most obvious in the diverging two-colour beam at lower left). This image uses simulated light beams and the refractive indices of water for the respective colours. The dispersion (separation of colours) is less than normally shown because the graphic strives for accuracy. The two extremes of the visible spectrum, red and violet, were chosen to illustrate dispersion as clearly as possible.