Rainbow

A rainbow is a colorful arc that appears in the sky when sunlight shines through tiny water droplets in the air, usually after rain.

The colors appear in this order:

1. Red
2. Orange
3. Yellow
4. Green
5. Blue
6. Indigo
7. Violet

A rainbow forms because of three processes:

• Refraction: Sunlight bends as it enters a raindrop.
• Reflection: The light reflects off the inside of the raindrop.
• Refraction again: As the light leaves the droplet, it bends once more and separates into different colors because each color bends by a slightly different amount.

Some interesting facts:

• A rainbow is always opposite the Sun. If the Sun is behind you and rain is in front of you, you may see one.
• No two people see exactly the same rainbow, because the light reaching each person’s eyes comes from different raindrops.
• Sometimes a double rainbow appears, with a second, fainter arc outside the first. In the second rainbow, the colors are reversed.

In short, a rainbow is a natural optical phenomenon created when sunlight is refracted, reflected, and dispersed by water droplets in the atmosphere.