Key Stage 3 Science / Physics
Rainbows are spectacular light phenomena due to the refraction of light (twice) by the water molecule and the total internal reflection that happens in the between. However, the chances are that in reality two rainbows will appear and not just one! Baring in mind how the rainbow is formed, can you think the reason why a secondary rainbow exists as well?
Light is twice internally reflected within the water droplet
Light exiting the rainbow will trigger the formation of a secondary one
It is the same rainbow that due to the humidity appears shifted
Light is partly refracted and partly reflected when it enters the surface of the water droplet
It is just an optical illusion
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