Rainbows that can also be called a bianglala are optical and meteorological phenomena in the form of colored lights are parallel to each other. Light parallel colors that will appear in the sky or other medium. The rainbow shape in the sky will look like a light bow with its tip leading to the horizon at a time of light rain. Or for more easily we can also find a rainbow on the surrounding waterfalls. Because the rainbow is derived from the result of light from the splash of water. The rainbow will look very clear when the sun is hot, because the refraction of the light that will produce the stronger.