|The physics of rainbows|
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Why do rainbows appear in the sky? In order to answer this question we need to be able to answer two distinct, though related, subsidiary questions:
If you would also like a hands-on demonstration, you can try our interactive Excel program. This will enable you to trace the paths of two typical rays of light (red and violet) as they are reflected and refracted within a droplet of rain. You can then experiment by adjusting the angle at which the incident ray of white light hits the raindrop.
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