Red, green and blue are the primary colours for additive mixing. When coloured lights are mixed together, it is called additive mixing. For example, red and green lights are used to make our brain perceive the image as yellow. If you look at a screen with a magnifying glass you will be able to see that only these three colours are being used.
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This is how TV and computer screens work. Mixing these colours in different proportions can make all the colours of the light we see. The primary colours of light are red, green and blue. Some estimate that humans are able to distinguish about 10 million colours. These three types of colour receptor allow the brain to perceive signals from the retina as different colours. (These cones have traditionally been known as blue-sensitive, green-sensitive and red-sensitive, but as each cone is actually responsive to a range of wavelengths, the S, M and L labels are more accepted now.) There are three types of cones in the human eye that are sensitive to short (S), medium (M) and long (L) wavelengths of light in the visible spectrum. Black objects absorb all colours so no light is reflected. White objects appear white because they reflect all colours.
If only blue light is shone onto a red shirt, the shirt would appear black, because the blue would be absorbed and there would be no red light to be reflected. Red light is the only light that is reflected from the shirt. The colours we see are the wavelengths that are reflected or transmitted.įor example, a red shirt looks red because the dye molecules in the fabric have absorbed the wavelengths of light from the violet/blue end of the spectrum. Objects appear different colours because they absorb some colours (wavelengths) and reflected or transmit other colours.
Extreme care must be taken to ensure that light from a laser never enters someone’s eyes.) Colour of objects (Lasers are extremely dangerous and can cause permanent eye damage. Light from a laser is monochromatic, which means it only produces one colour.
Light from a torch or the Sun is a good example of this. White light is actually made of all of the colours of the rainbow because it contains all wavelengths, and it is described as polychromatic light.
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