The brightest part of a rainbow appears because certain raindrops send sunlight back to your eye at about 40° to 42°.
Weather - Facts for Kids

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Random Facts About Weather For Kids
The water drops that make rainbows are usually falling rain or mist (tiny water drops in air), but they can also be spray from waterfalls or lawn sprinklers!
A tornado is a rapidly spinning column of air that reaches from a storm cloud all the way down to the ground!
Each color in a rainbow comes from a slightly different angle: bright red shines at about 42° from the rainbow’s center, and violet appears closer to 40° — with the other colors in between!
Florida gets more lightning than any other U.S. state — about 1.2 million lightning strikes every year — which is why it’s known as the lightning capital of the United States!