what should we remember when we see a rainbow
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For colours seen by the human eye, the most commonly cited and remembered sequence is Newton's sevenfold red, orange, yellow, green, blue, indigo and violet, remembered by the mnemonic Richard Of York Gave Battle In Vain (ROYGBIV). Rainbows can be caused by many forms of airborne water.
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We see rainbow when the sun is behind us and falling rain is in front of us. When sunlight strikes a falling drop of water it is refracted, changed in direction, by the surface of water. The light continues into the drop and is reflected from the back of the drop to the front.
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