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Ash Catchem

on 27 April 2010

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Transcript of Rainbows

RAINBOWS What is a rainbow? Rainbows are optical spectrums. Rainbows are nothing more then light being reflected and bent. The light is reflected as multiple colours Rainbows are most commonly seen once sunlight
reflects of any form of water. This includes
dew, mist or spray. The colours of the rainbows are red, orange, yellow, green,
indigo and violet. You can remember the orders of the colours through
popular mnemonics like Roy G. Biv. Most people have never noticed that when you look at a rainbow, the sun is always behind you, and the centre of the arc is in the opposite direction facing towards the sun. While the rain is in the direction of the rainbow. In Norse Mythology, it's said that the Irish leprechauns hide a pot of gold at the end of the rainbow. When a ray of sunlight enters a raindrop, the sunlight is directed into a different direction 2 times, and when they exit from the second redirection, the ray of sunlight gets directed from 40 - 42 degrees. The violet and blue colours bend at a 40 degree angle while the red and orange colours bend at a 42 degree angle. There is a similar phenomenon that is close to the rainbow effect. Instead of an arc, it appears to be a full circle. Halos appear to look the same as rainbows, but halos appear through ice crystals instead of water prisms. Halos also have the the same colours but in an opposite order. (starting from the inside) Throughout history, scholars have tried to explain the rainbow effect through mythology. Here is an example:
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