Hey, why does white light can be split into its different wavelengths by a prism?
Answer When a thin beam light goes from air to a thick solid (like glass) at an angle, it bends. When it goes from a thick solid back to air, it bends again. In both cases, the steeper the angle, the more the bending of thebeam. By making a triangle of the solid, we can cause the light beam to bend twice at a steep angle — once when it enters the triangle, once when it leaves. In both bendings, however, blue light bends more than red light. Indeed, all the colors bend to a different extent. Thus, as the light that was originally white (ie, a combination of many colors) leaves the triangle, the different colors are separated out.
