GCSE Physics (AQA)

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Colour Filters

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Waves Electromagnetic waves

Colour Filters

5:09 Colour and Visible Light
Spec 4.6.2.6
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  • Color filters are transparent materials that allow only certain wavelengths of light through.
  • Visible light consists of electromagnetic waves with wavelengths determining the color we see.
  • A blue color filter is a transparent material that looks blue and restricts certain colors of light.
  • Red light directed at a blue filter is absorbed, meaning it doesn't pass through or bounce off.
  • Blue light directed at a blue filter passes through, meaning it is transmitted.
  • Color filters isolate wavelengths from white light, allowing only specific colors to pass through.
  • White light consists of all colors of visible light, with different wavelengths traveling together.
  • When white light is directed at a blue filter, only blue light is transmitted, filtering out other colors.
  • Color filters are used in LED casings and stage lights to filter colors from white light.
  • Using multiple color filters, such as blue and red, results in light passing through only the first filter.
  • Objects' colors can appear to change when viewed through color filters.
  • The color of an object determines what wavelengths of visible light reflect off it.
  • Orange fruits appear orange because of the orange light reflecting off them.
  • Viewing orange fruits through an orange filter doesn't change their appearance as the orange light passes through.
  • Viewing orange fruits through a blue filter results in a black shadow as no blue light reflects off them.
  • Objects appear black when no visible light reflects off them.
  • Understanding how color filters work is important for exams, including explaining what is seen when applying them.

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