A rainbow is one of the most beautiful natural sights in the sky. It appears when sunlight passes through water droplets in the atmosphere and separates into different colours. A rainbow is commonly described as having seven colours: Red, Orange, Yellow, Green, Blue, Indigo, and Violet.
These seven rainbow colours are arranged in a specific sequence, which is easy to remember using the acronym VIBGYOR. Learning the rainbow colour names is useful for children, students, and anyone interested in understanding nature and basic science.
In this article, you will learn the 7 rainbow colours name in order, their characteristics, how to identify each colour, and why a rainbow appears after rainfall.
What Are the 7 Colours of the Rainbow?
The seven commonly recognised colours of a rainbow are Red, Orange, Yellow, Green, Blue, Indigo, and Violet. They appear in this order, starting from the outer edge of a primary rainbow and moving towards its inner edge.
Here is a quick list of all seven rainbow colours:
| No. | Rainbow Colour Name | Position |
|---|---|---|
| 1 | Red | First |
| 2 | Orange | Second |
| 3 | Yellow | Third |
| 4 | Green | Fourth |
| 5 | Blue | Fifth |
| 6 | Indigo | Sixth |
| 7 | Violet | Seventh |
Remember: The first letter of each colour, read backwards from Violet to Red, forms the word VIBGYOR. This is a popular way to remember the sequence of rainbow colours.
Rainbow Colours with Picture
A rainbow is easiest to understand when you can see its colours arranged in the correct sequence.
The following diagram shows all seven rainbow colours together.
The colour sequence from the outer edge to the inner edge is:
- Red
- Orange
- Yellow
- Green
- Blue
- Indigo
- Violet
Each colour gradually blends into the next, creating the beautiful appearance of a rainbow.
7 Rainbow Colours Name in Order
Each rainbow colour has a different appearance and wavelength. Red has the longest wavelength among the seven traditionally named colours, while Violet has the shortest.
Let’s understand each of the seven rainbow colours individually.
1. Red
Red is the first colour of the rainbow when viewed from the outer edge. It has the longest wavelength among the seven traditionally recognised rainbow colours.
Red is a bright and easily recognisable colour. It is commonly associated with warmth, energy, and attention.
Examples of red objects in nature:
- Apples
- Roses
- Tomatoes
- Cherries
2. Orange
Orange is the second colour of the rainbow. It appears between Red and Yellow.
It is a warm colour that combines the visual characteristics of red and yellow. Orange can be seen in several fruits, flowers, and natural objects.
Examples of orange objects in nature:
- Oranges
- Carrots
- Marigold flowers
- Pumpkins
3. Yellow
Yellow is the third colour of the rainbow. It appears between Orange and Green.
It is a bright colour commonly associated with sunlight and brightness. Yellow is one of the easiest rainbow colours to recognise.
Examples of yellow objects in nature:
- Sunflowers
- Lemons
- Bananas
- Buttercups
4. Green
Green is the fourth colour of the rainbow. It appears between Yellow and Blue.
Green is commonly found in nature and is strongly associated with plants, trees, and vegetation. It is also the colour of chlorophyll, the pigment that helps plants absorb light for photosynthesis.
Examples of green objects in nature:
- Grass
- Leaves
- Cucumbers
- Green apples
5. Blue
Blue is the fifth colour of the rainbow. It appears between Green and Indigo.
It is commonly associated with the sky and large bodies of water. Blue is also one of the most familiar colours found in nature.
Examples of blue objects in nature:
- Clear blue skies
- Blueberries
- Blue flowers
- Blue butterflies
6. Indigo
Indigo is the sixth colour of the rainbow. It appears between Blue and Violet.
It is a deep blue-violet shade. Indigo can sometimes be difficult to distinguish from blue and violet because the colours blend gradually into one another.
Examples of indigo shades and objects:
- Indigo-dyed fabric
- Deep indigo paint
- Some dark blue-violet flowers
7. Violet
Violet is the seventh and final traditionally named colour of the rainbow. It appears at the inner edge of a primary rainbow.
It has the shortest wavelength among the seven traditionally recognised rainbow colours. Violet is a shade that appears between blue and purple in everyday colour descriptions.
Examples of violet objects in nature:
- Violet flowers
- Lavender
- Purple orchids
- Some varieties of violets
VIBGYOR: The Easy Way to Remember Rainbow Colours
VIBGYOR is a popular acronym used to remember the seven colours of a rainbow.
Each letter represents one colour, arranged from the shortest-wavelength end to the longest-wavelength end.
| Letter | Colour Name |
|---|---|
| V | Violet |
| I | Indigo |
| B | Blue |
| G | Green |
| Y | Yellow |
| O | Orange |
| R | Red |
Remember that VIBGYOR represents the reverse order of the colours when moving from the outer edge to the inner edge of a primary rainbow.
Another commonly used acronym is ROYGBIV, which follows the opposite order:
Red, Orange, Yellow, Green, Blue, Indigo, Violet.
Both acronyms represent the same seven traditionally recognised rainbow colours.
How Is a Rainbow Formed?
A rainbow forms when sunlight interacts with water droplets suspended in the atmosphere. This usually happens when sunlight shines through rain or water droplets while an observer is positioned with the Sun behind them.
Three important optical processes contribute to rainbow formation:
1. Refraction
When sunlight enters a water droplet, it changes direction because light travels at different speeds in air and water. This process is called refraction.
2. Dispersion
White sunlight contains different wavelengths of visible light. Each wavelength bends by a slightly different amount when entering and leaving a water droplet. This separation of white light into different colours is called dispersion.
3. Internal Reflection
After entering the water droplet, light reflects from the inside surface before travelling back out. As the light leaves the droplet, it refracts again, helping the separated colours reach the observer.
The combination of these processes produces the colourful arc that we see in the sky.
Why Does a Rainbow Have Seven Colours?
A rainbow is traditionally described as having seven colours because its visible spectrum is commonly divided into seven named colour groups.
However, scientifically, a rainbow does not contain only seven separate colour bands. It displays a continuous spectrum of colours, with each colour gradually blending into the next.
The seven-colour classification is a convenient way to learn and describe the visible spectrum.
The sequence is:
Red → Orange → Yellow → Green → Blue → Indigo → Violet
Which Rainbow Colour Has the Longest and Shortest Wavelength?
The seven traditionally named rainbow colours have different wavelength ranges. Red has the longest wavelength, while Violet has the shortest.
Here is a simplified comparison:
| Rainbow Colour | Approximate Wavelength Range |
|---|---|
| Red | 620–750 nm |
| Orange | 590–620 nm |
| Yellow | 570–590 nm |
| Green | 495–570 nm |
| Blue | 450–495 nm |
| Indigo | Approximately 425–450 nm |
| Violet | 380–425 nm |
Note: These are approximate wavelength ranges. The boundaries between visible colours are not fixed because the rainbow spectrum is continuous.
Why Do We Sometimes See a Double Rainbow?
Sometimes, two rainbows appear in the sky at the same time. This phenomenon is called a double rainbow.
A double rainbow forms when sunlight undergoes two internal reflections inside water droplets instead of one.
The primary rainbow is usually brighter, while the secondary rainbow appears outside it and is generally fainter.
There is also an important difference in their colour sequences:
- Primary rainbow: Red appears on the outer edge and Violet on the inner edge.
- Secondary rainbow: Violet appears on the outer edge and Red on the inner edge.
The colours of the secondary rainbow appear in the reverse order because of the additional internal reflection.
Frequently Asked Questions About Rainbow Colours
The seven rainbow colours in order are Red, Orange, Yellow, Green, Blue, Indigo, and Violet. They are commonly remembered using the acronym VIBGYOR or ROYGBIV.
Red is the first colour of a primary rainbow when viewed from the outer edge. It has the longest wavelength among the seven traditionally named rainbow colours.
Violet is the last colour of a primary rainbow when moving from the outer edge towards the inner edge. It has the shortest wavelength among the seven traditionally named colours.
VIBGYOR is an acronym used to remember the seven rainbow colours in reverse order. It stands for Violet, Indigo, Blue, Green, Yellow, Orange, and Red.
Both acronyms represent the same seven rainbow colours. VIBGYOR lists them from Violet to Red, while ROYGBIV lists them from Red to Violet.
No. A rainbow displays a continuous spectrum of visible light. The seven colours are a traditional classification used to make the spectrum easier to understand and remember.
Red has the longest wavelength among the seven traditionally recognised rainbow colours. Its approximate visible wavelength range is 620–750 nanometres.
Violet has the shortest wavelength among the seven traditionally recognised rainbow colours. Its approximate visible wavelength range is 380–425 nanometres.
A rainbow can appear when sunlight interacts with water droplets in the atmosphere. Refraction, dispersion, and internal reflection separate sunlight into different colours, producing the rainbow.
