- A rainbow is a natural spectrum of sunlight in the form of bows appearing in the sky when the sun shines on rain drops.
- It is combined result of reflection, refraction and dispersion of sunlight from water droplets, in atmosphere.
- Always it formed in the direction opposite to the sun.
- To see a rainbow, the sun must behind us and the water droplets falls infront of us.
- When a sunlight enters into a spherical rain¬drop, it is refracted and dispersed. The different colours of light bent in different angles.
- When different colours of light fall on the back inner surface of drop, it (water drop) reflects (different colours of light) internally (total internal reflection).
- The water drops again refracts the different colours, when it comes out from the raindrop.
- After leaving this different colours from the raindrop as rainbow, reach our eye. Thus, we see a rainbow.
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