Continuous Colour from Red to Violet
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This diagram shows six electromagnetic waves. Each wave corresponds with a colour within the visible spectrum that an observer might recognise.
Remember that:
- Electromagnetic waves, which are a form of electromagnetic radiation, propagating from a light source, travel through space and encounter different materials.
- Colour is not a property of electromagnetic radiation, but an aspect of visual perception.
- A human observer can distinguish between colours corresponding with many thousands of wavelengths of light in the visible spectrum. These colours are often called spectral colours.
- The largest part of the electromagnetic spectrum is outside the wavelengths of visible light and so invisible to a human observer.
- Beyond red are infrared, microwaves and radio waves for example. Some radio waves have a wavelength longer than a kilometre (1000 metres).
- Beyond violet are ultraviolet, X-rays, and gamma rays for example. Some gamma rays have a wavelength of one billionth part of a metre.
- There are no properties of electromagnetic radiation that distinguish visible light from other parts of the electromagnetic spectrum.
- Objects appear to be different colours to an observer depending on the wavelengths, frequencies and amplitude of visible light at the moment it strikes the retina at the back of the eye.
Description
Continuous Colour from Red to Violet
TRY SOME QUICK QUESTIONS AND ANSWERS TO GET STARTED
No! The visible spectrum is just the small part of the electromagnetic spectrum our eyes are tuned to.
A human observer is a person who watches something from their own unique point of view.
Researchers estimate the number of colours the human eye can distinguish is between one and seven million.
Red has the longest wavelength whilst violet has the shortest.
About the diagram
About the diagram
- This diagram is about the visible spectrum and which wavelengths of electromagnetic radiation correspond with the different colours we see in the world.
- It shows that a human observer can distinguish between colours corresponding with thousands of wavelengths of visible light.
- The visible spectrum (a rainbow for example) can be thought of as six bands of colour or as being made up of light rays of different wavelengths, each distinguished by its measurement in nanometres.
- The visible spectrum is made up of an infinite gradation of wavelengths and colours. The total number of colours in the world is limited only by the sensitivity of human vision and the size of the units of measurement used to calculate wavelength.
- The list down the left of the diagram represents the visible spectrum as bands of wavelengths and bands of colour.
- The scale along the bottom marks out the visible spectrum in nanometres with the corresponding colours shown above.
Remember that:
- Objects appear to be different colours to an observer depending on their wavelength.
- The name given to light that contains all wavelengths of the visible spectrum is white light.
- When all wavelengths contained in white light reflect off a neutral coloured surface then the object appears white to an observer.
- When a narrow band of wavelengths reflect off a neutral coloured surface then the object appears coloured to an observer.
- The colour an observer sees depends on the wavelengths of visible light emitted by a light source and on which of those wavelengths are reflected off an object.
- Although a human observer can distinguish between many thousands of wavelengths of light in the visible spectrum our brains often produce the impression of bands of colour.
Some key terms
Electromagnetic spectrum
The electromagnetic spectrum includes electromagnetic waves with all possible wavelengths of electromagnetic radiation, ranging from low energy radio waves through ...
White light
White light is the name given to visible light that contains all wavelengths of the visible spectrum at equal intensities ...
Visible spectrum
The visible part of the electromagnetic spectrum is called the visible spectrum. The visible spectrum is the range of wavelengths ...
Rainbow colours
Rainbow colours are the bands of colour seen in rainbows and in other situations where visible light separates into its ...
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