Wavelengths from Red to Violet
Wavelengths from Red to Violet
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About the diagram
About the diagram
- This diagram is about which wavelengths of electromagnetic radiation correspond with the different colours we see in the world.
- The important fact to remember is that the wavelengths of light within the visible spectrum correspond with the spectral colours we see between red and violet.
- The white arrows in the diagram show the Sun emitting sunlight at all wavelengths of the visible spectrum.
- The term white light is used when all wavelengths and the colours of the visible spectrum are mixed together.
- The full spectrum of colours between red and violet illustrates that each and every wavelength between 700 and 430 nanometres produces a different colour.
- The list on the left shows the ranges of wavelengths that correspond with the most prominent spectral colours
- The scale along the bottom is marked in nanometres and shows the visible spectrum divided into coloured bands.
- 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.
- The wavelengths absorbed or reflected off an object.
- Although a human observer can distinguish between many thousands of wavelengths of light in the visible spectrum, the impression is often of predominant bands of colour.
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