Why do you see rainbow?

Answer 1

We see rainbows when the sun is behind us and falling rain is in front of us.

When sunlight strikes a falling drop of water it is refracted, changed indirection, by the surface of the water.

The light continues into the drop and is reflected from the back of the drop to the front. When the beam hits the front it is refracted again and emerges from the drop as the color spectrum that we see in a rainbow.

The water drop acts like a prism to separate the light into its different wave lengths.

Answer 2

The water vapor in the air catches sunlight (usually after a storm because it is more humid) and produces a rainbow.

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A rainbow is seen when the rain is in front of you and the Sun is directly behind you. You can create your own rainbow on a very sunny day if you spray a rain of water drops from a hose pipe, so that the "rain is in front of you and the Sun is behind.

The seven colours of the rainbow appear because the Sun shines into every separate drop of water, is bounced back towards you. The water drops receive white light but then split the light into the seven colours when it enters and leaves each drop.

We usually see a "bow", part of a perfect circle, because we are at ground level. When flying high it is sometimes possible to see a full circle of the seven colours.

Answer 3

Rainbows are formed when sunlight is refracted, or bent, by raindrops in the air. This causes the light to separate into its different colors, creating the recognizable arc shape with red on the outer edge and violet on the inner edge. Viewing a rainbow requires specific conditions, such as sunlight and rain in the air opposite the observer.