Colours

Colour is everywhere! Look around you. How many colours can you see? Do you know the names of colours?
Let’s learn about the colours…

Colour is a property of light as seen by people.Now we will see different colours.

Let’s look at the different colours and their examples:

Examples	Colours
	Red
	Blue
	Yellow
	Orange
	Green
	Purple
	Pink
	White
	Black
	Violet
	Gold
	Silver
	Brown
	Grey
	Indigo

Colours are classified as:

Name	Composition	Properties
Primary Colours	Blue, Red and Yellow	1. These are pure colours that have no component other than themselves.
Secondary Colours	Orange, Green and Purple	1. These are composed of the primary colours on either side of it on the colour wheel. 2. For example: Orange = red+yellow, Green = blue+yellow, Purple = blue+red.
Tertiary Colours	Orange-red, Orange-yellow, Yellow-green, Blue-green, Blue-purple, and Red-purple	1. Tertiary colours have more of one colour than the other.

Colours also express emotions.

Life throws challenges and every challenge comes with rainbows and lights to conquer it.

The Measurement of Colour:

The measurement of colour is known as colorimetry. A variety of instruments are used in this field e.g. spectrophotometers – they analyse light in terms of the amount of energy present at each spectral wavelength.

Note:

• a. The reddish colours are the long wavelengths.
• b. The greenish colours are the mid-size wavelengths.
• c. The bluish colour are the short wavelengths.

Rainbow

Colours of rainbow: There are seven colours in the rainbow: red, orange, yellow, green, blue, indigo and violet.

1. A rainbow is a multi-coloured arc made by light striking water droplets.
2. The most familiar type rainbow is produced when sunlight strikes raindrops in front of a viewer at a precise angle (42 degrees). Rainbows can also be viewed around fog, sea spray, or waterfalls.
3. A rainbow is an optical illusion—it does not actually exist in a specific spot in the sky. The appearance of a rainbow depends on where you’re standing and where the sun (or other source of light) is shining.
4. The sun or other source of light is usually behind the person seeing the rainbow. In fact, the centre of a primary rainbow is the antisolar point, the imaginary point exactly opposite the sun.
5. Rainbows are the result of the refraction and reflection of light. But, what are refraction and reflection?
Both refraction and reflection are phenomena that involve a change in a wave’s direction. A refracted wave may appear “bent”, while a reflected wave might seem to “bounce back” from a surface or other wave front.

Some Interesting Facts:

1) The British and Canadian spelling of the word is colour, the word color is used in American English.
2) People who cannot see colours or have a distorted sense of colour are called colour blind.
3) Colours are sometimes added to food. Food colouringis used to colour food, but some foods have natural colourings, like beta carotene.
4) Approximately seven million different colours can be seen by the human eye.
5) The primary colours for television screens and computer monitors are red, green and blue.
6) Printers use magenta, yellow and cyan as their primary colours; they also use black.

Your attitude is like a box of crayons that colour your world.