Facts about White Light

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This diagram introduces white light, the name given to light that contains all wavelength of the visible spectrum.

Remember that:

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Description

Facts about White Light

TRY SOME QUICK QUESTIONS AND ANSWERS TO GET STARTED
What is white light?
White light is the name for light containing all the wavelengths of the visible spectrum.
When white light strikes an object, what determines the colour an observer sees?
When white light strikes an object, its colour is determined by which wavelengths of light are absorbed and which wavelengths are reflected towards the observer.
What is the name for light containing all the wavelengths of the visible spectrum at equal intensity?
White light contains all the wavelengths of the visible spectrum at equal intensity.
Why is light colourless
Although pure white light is perceived as colourless, it actually contains all colours in the visible spectrum.

About the diagram

About the diagram
  • This diagram introduces white light, the name given to light that contains all wavelengths of the visible spectrum.
Remember that:
  • White light contains all the wavelengths of the visible spectrum, but to produce white light, each wavelength must be of equal intensity.
  • White light contains all wavelengths of light that correspond with the colours of the rainbow.
  • The white light human beings see does not include infrared and ultraviolet wavelengths of light because they are outside the visible spectrum.
Now let’s look at that in detail:
  • White light is the name given to visible light that contains all wavelengths of the visible spectrum at equal intensities.
  • As light travels through a vacuum or a medium it is described as white light if it contains all the wavelengths of visible light.
  • As light travels through the air it is invisible to our eyes.
  • The term white light doesn’t mean light is white as it travels through the air.
  • When white light strikes a neutral-coloured object and all wavelengths are reflected it appears white to an observer.
  • When some wavelengths are absorbed by an object and others are reflected then it is the reflected wavelengths that determine the colour an observer sees.

Some key terms

Visible spectrum

The visible part of the electromagnetic spectrum is called the visible spectrum. The visible spectrum is the range of wavelengths ...

Sunlight

Sunlight is light emitted by the Sun and is also called daylight or visible light. Sunlight is only one form ...

RGB colour model

To be clear about the RGB colour model it is useful to remember first that: The visible spectrum is the ...

Electromagnetic spectrum

The electromagnetic spectrum includes electromagnetic waves with all possible wavelengths of electromagnetic radiation, ranging from low energy radio waves through ...

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