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Actually it is not the best example of refraction because a rainbow is seen in the oposite direction to the light source, the sun. It is caused by a combination of reflection and refraction. Here is a copied snipped from wikipedia:

"White light separates into different colours on entering the raindrop because red light is refracted by a lesser angle than blue light. On leaving the raindrop, the red rays have turned through a smaller angle than the blue rays, producing a rainbow."

Refraction is simply that light travels slower in denser material and because different colours of light have different wave lengths those colours will change their angle more and so the light sperates.

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14y ago

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Is a rainbow caused by reflection or refraction?

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