7 Colours of Rainbow | What are the seven colours of the rainbow?
We all know that there are seven colours in the rainbow. When the white colour of the sunray is scattered by a water droplet, it always breaks into seven colours in this order:
- RED ↣ RED
- ORANGE ↣ ORANGE
- YELLOW ↣ YELLOW
- GREEN ↣ GREEN
- BLUE ↣ BLUE
- INDIGO ↣ INDIGO
- VIOLET ↣ VIOLET
Sometimes, these seven colours coincide with each other as a shape of arc and this is called a rainbow.
Do you know why the order of the colours of a rainbow is like that?
The reason behind this matter is the different wavelengths of different colours.
Yes, wavelengths. The wavelength of light rays of each colour is not equal. The wavelengths of each colour ray are different. The ray which has the highest wavelength is scattered at the highest angle. Among the Seven colours of white light, red has the highest wavelength and so, it is scattered at the highest angle. On the other hand, as purple light has the shortest wavelength, it scatters at the lowest angle.
Wavelengths of the seven Colours of Rainbow
You can see the wavelengths of the seven colours from this chart given below –
| Light colour | Wavelength |
| Red | 8000 Angstrom |
| Orange | 6300 Angstrom |
| Yellow | 5800 Angstrom |
| Green | 5300 Angstrom |
| Blue | 5050 Angstrom |
| Indigo | 4800 Angstrom |
| Violet | 4000 Angstrom |