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Why Does a Rainbow Always Put Red on the Outside? · page 1 of 10
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Mira stood on the wet hilltop with a prism in one hand and a notebook in the other. After the summer shower, a rainbow curved above the meadow, bright red along its outer edge.

Why Does a Rainbow Always Put Red on the Outside?
why questions · Ages 9-12

Why Does a Rainbow Always Put Red on the Outside?

Water droplets bend and split sunlight by wavelength, and red light bends less than violet light, fixing the order of the colors.

The whole story

1. Mira stood on the wet hilltop with a prism in one hand and a notebook in the other. After the summer shower, a rainbow curved above the meadow, bright red along its outer edge.

2. Mira turned the prism toward the sunlight. A little band of colours appeared on the paper beside her: red, orange, yellow, green, blue, and violet.

3. She checked the rainbow, then checked the prism, then checked the rainbow again. The colours always kept their order. Why did red stay on the outside?

4. The next morning, Mira collected a few clear drops in a jar. She wondered whether each tiny drop might be doing the work of the whole rainbow.

5. At the kitchen window, Mira sent a thin beam of sunlight through one water droplet. The white beam spread into colours, as if the sunlight had been carrying a hidden bundle.

6. Sunlight bent when it entered the drop. It reflected from the drop’s curved back, then bent again as it came out. Those bends spread the colours apart.

7. Mira tested the colours one at a time. Red changed direction only a little. Violet changed direction more, while the other colours settled between them.

8. Mira pictured millions of raindrops catching the same sunlight. In every drop, red bent less than violet, so red reached the outside and violet stayed nearer the inside.

9. Mira wrote down the answer before the colours faded. Water droplets bend and split sunlight by wavelength, and red light bends less than violet light, fixing the order of the colours.

10. The rainbow did not choose its colours or place them by chance. Each raindrop followed the same quiet rule, and the sky kept its order.

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