Diffraction, the lines are so close together that they approach the wave length of the various colors of visible light.
(Note, some insects and birds get their coloring this way too.)
A prism
White light doesn't produce different colors. The only way to make white light is tocombine light with all of the different colors. So if you already have white light, allof the colors are already there. You only have to separate them in order to see them.
A prism.
White light has all visible frequencies incorporated in it. A prism refracts different frequencies at different angles so the different frequencies (colors) spread out.
The light is refracted (bent) causing it to separate into different colors.
The reason white light is separated into colors is because light of different colors have slightly different indices of refraction. Thus, for example, red light might be bent a little bit more than blue light.
White light appears white because it is a conglomeration of all the different wavelengths of light. A prism will separate the different wavelengths because they refract (or bend) at different angles through the prism.
White light contains all wavelengths of colors. To make a rainbow, you need to separate those wavelengths (colors). This is accomplished by bending, or diffracting light. Different wavelengths of light are bent differently when they are passed through a transparent prism. When they are bent diffrently, they start to separate from one another and become visible to the eye as different colors.
Refraction can separate white light into the spectrum of visible light from red to violet.
A clear glass prism (and rain drops in the sky on a sunny day) are able to separate white light into the colours of the rainbow. The basic reason is that white light is reflected at different angles because of the different wavelengths.
Refraction is when light bends through an object. White light is made up of all the colors of the spectrum. Different colors have different wavelengths, therefore they bend at different angles. So when white light passes through a prism the different colors bend at different angles, so they separate to produce the rainbow of light that we see.
Yes, although the separate colors are perceived to your eye as white. If you have a prism you can separate white light into the continuous color spectrum. This effect is also achieved in rainbows.