a rainbow is formed by refraction of light by separating light / splitting light into all different colors
rainbow is light_wave. rainbow is multicolored_light_arc. green is colour_of_rainbow. rainbow is not multicolored_light_arc. rainbow is not light_wave. red is not colour_of_rainbow. blue is not colour_of_rainbow. red is colour_of_rainbow. blue is colour_of_rainbow. green is not colour_of_rainbow.