How is a rainbow formed

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How is a rainbow formed?

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Rainbows only happen under certain conditions.
It must be raining, the sun must still be visible
and it must be below a 40o angle in the
sky. When that happens the light hits raindrops
at the right angle. The raindrops act like a
prism and split the light into the colours that
make it up. The rainbow is curved because the
surface of the raindrops that the light shines
through is curved. The colours are always in the
same order because they are bent different
amounts by the water droplet. Until Sir Isaac
Newton studied light, no one knew what caused
them. Now you know what is needed to form a
rainbow they should be easier to watch out for.
Introduction
Put your ideas in order.
Conclusion
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How do we see colour on a TV?