7 Colours of Rainbow || What are the seven colours of the rainbow?

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:

  1. RED ↣ RED
  2. ORANGE ↣ ORANGE
  3. YELLOW ↣ YELLOW
  4. GREEN ↣ GREEN
  5. BLUE ↣ BLUE
  6. INDIGO ↣ INDIGO
  7. 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
Orange6300 Angstrom
Yellow5800 Angstrom
Green 5300 Angstrom
Blue5050 Angstrom
Indigo4800 Angstrom
Violet4000 Angstrom

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