What Causes A Rainbow

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Rainbow
  1. What Causes A Rainbow To Form

How Rainbows Are Formed/What Causes a Rainbow? The principle explained above can be applied to how rainbow is formed in the sky. When there are water droplets in the atmosphere for instance, during or immediately following a shower of rain, there will be thousands of these tiny droplets (raindrops) floating around in the air. Iridescent clouds, known as 'fire rainbows' or 'rainbow clouds,' occur when sunlight diffracts off water droplets in the atmosphere. And the recipe for these heavenly sights is actually pretty simple.

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What Causes A Rainbow

What Causes A Rainbow To Form

• • • Written by: HUNG Fan-yiu • (Photo taken by observer at Airport Meteorological Office, Hong Kong Observatory, 26 July 2003) A rainbow picture is usually taken with sunlight from the back of the photographer. Sunlight is made up of light of every wavelength (loosely, colour). When there are water droplets in the atmosphere, for instance when rain has fallen, sunlight will get refracted (i.e. Bent) in a water droplet. Blue light has a shorter wavelength and is refracted more than light with a longer wavelength such as red light. For this reason, blue (red) light is located in the inner (outside) part of the rainbow. Each of the colours in the rainbow comes to the eye from a different set of water droplets.