Many of us have seen rainbows in the sky once the sun starts shining again after a spell of rain.
We need some water droplets in the air – like rain or even fog – and we need the Sun to be behind us and quite low to the ground. This is because aThe light that comes from the sun seems white to us. But the white light we see in everyday life is actually made up of a mix of different colors. When the light goes through a raindrop, these colors can separate out.You wouldn't know it to look at it, but light travels in waves, like waves moving across the ocean.
Each of the different wavelengths is refracted by a slightly different amount. If the light hits the raindrop at the right angle, the refraction separates the wavelengths out into their different colors. As lots of light is refracted through lots of raindrops, we see these colors as a rainbow in the sky. The order the colors come in is set by how long their wavelength is.
Blue and green are next to each other in the color spectrum, which is why we can see turquoise where they blend into each other. Some colors, though, are mixes of colors that aren't next to each other in the spectrum.
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