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Colours
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General Knowledge for Kidsmocomi.com/learn/general-knowledge/
Colours
The word colour comes from the Latin word colos which means cover or covering.
Astronomers use the colour of stars to determine their size. The bigger the star, the bluish it looks. And the smaller the star the warmer (red/yellow) it appears.
Black holes are stars which are very dense and hence do not allow light (and hence colour) to escape.
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Colours
Each colour has a di�erent wave-length. For example the wavelength for blue is 475 nm (nano meter) and the wavelength for red is 650 nm.
Chromatics, colorimetry, chro-matography, are words that are used to describe the science of colour.
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Colours
The human eye distinguishes colour based on the sensitivity of cells in the retina to light of various wavelengths.
Shades of a colour are created by adding black to the base colour.
Tints of a colour are created by adding white to the base colour.
Tints
Shades
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In general blue, green and purple are considered cool colors while yellow, orange and red hues are considered warm.
Complementary colors are those which exist opposite to each other on the color wheel. They tend to look very vibrant when used together making each colour look very noticeable.
Cool colours
Warm colours
Colours
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Colours
Analogous colours exist next to each other on the colour wheel. When used together they give a very pleasant e�ect.
Black, white, gray and some beige & brown shades are called neutral colours or earth tones. These colours do not show up on the colour wheel.
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Colours
Colour circleBlue
Greenish Blue
Bluish Green
Green
Yellow
Orange
Red
Purple
Violet
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The RBG colour model is an addi-tive model used in computer moni-tors, TV's and mobiles.
The CMYK colour model is a subtractive one and is used in printing.
The ability of animals to take on the colour of their environment is known as camou�age.
Colours
Television
Mobiles
Printer
Camau�age
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Iridescence is the property of certain surfaces that appear to change colour as the angle of view or the angle of light re-�ecting on it changes.
Soap bubbles and the inside of an abalone shell are examples of iridescence.
Colours
Image scource: www.wikipedia.org, This file is licensed under the Creative Commons Attribution-Share Alike 3.0
Soap bubbleAbalone shell
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A dichoric material is one which causes visible light to be split up into distinct beams of di�erent wavelengths or one in which light rays having di�erent polarisa-tions are absorbed by di�er-ent amounts.
You can observe this when you press a LCD display with your �ngers.
Colours
LCD Display
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