Why does rainbow is like a …

- A rainbow is an arch of seven colours and is produced by the dispersion of the Sun’s light by tiny raindrops present in the atmosphere.
- The observer receives only one colour from the raindrop at a time.
- The red rays from the drops make a certain angle with the eye line joining the Sun and the observer.
- So, all water drops which appear red will make the same angle with the line of vision.
- Hence, they will appear in the form of an arc of a circle with its centre on the eye line.
- The other colours also appear in a similar manner.
- Red rays make an angle of 42.8° with the line of vision and is seen on the outer edge of the rainbow.
- Violet rays make an angle of 40.8° with the line of vision and is seen on the inner edge of the rainbow.
- Thus, the rainbow appears in the form of a bow or a semi circle