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Questions and Answers
What is the minimum number of colours required to produce white light?
What is the term used to describe the process of producing white light by combining a primary colour and its complementary colour?
Why does an object appear black when light shines on it?
What is the term used to describe the splitting of white light into its constituent colours?
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What is the purpose of polarised sunglasses?
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What is the term used to describe the restriction of a wave's vibration to one plane?
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What type of colours are Red, Green, and Blue?
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What happens to the wavelengths of light when they hit an object?
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What is the result of combining a primary colour with its complementary colour?
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What is the purpose of using a second prism in an experiment?
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What is the term used to describe the restriction of a light wave's vibration to one plane?
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What is an application of polarisation in material testing?
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Study Notes
White Light and Colour
- White light can be produced by combining three primary colours of equal intensity: Red, Green, and Blue.
- All other colours can be produced by combining these three colours in varying ratios.
- Complementary colours are produced by mixing a primary colour with its opposite secondary colour, resulting in white light.
Colour and Reflection
- When white light hits an object, some wavelengths are absorbed and others are reflected.
- The object's "colour" is made up of the reflected wavelengths.
- If the light shining on the object does not contain wavelengths that the object naturally reflects, it appears black.
Dispersion and Recombination
- Dispersion is the splitting up of white light into its constituent colours.
- Dispersion can be reversed by using recombination and a second prism.
Polarisation
- Polarisation of a wave occurs when the direction of vibration is restricted to one plane.
- Polarisation is used in applications such as:
- Polarised sunglasses, which help to see beneath the surface of a fluid.
- Testing the internal stress of materials.
White Light and Colour
- White light can be produced by combining three primary colours of equal intensity: Red, Green, and Blue.
- All other colours can be produced by combining these three colours in varying ratios.
- Complementary colours are produced by mixing a primary colour with its opposite secondary colour, resulting in white light.
Colour and Reflection
- When white light hits an object, some wavelengths are absorbed and others are reflected.
- The object's "colour" is made up of the reflected wavelengths.
- If the light shining on the object does not contain wavelengths that the object naturally reflects, it appears black.
Dispersion and Recombination
- Dispersion is the splitting up of white light into its constituent colours.
- Dispersion can be reversed by using recombination and a second prism.
Polarisation
- Polarisation of a wave occurs when the direction of vibration is restricted to one plane.
- Polarisation is used in applications such as:
- Polarised sunglasses, which help to see beneath the surface of a fluid.
- Testing the internal stress of materials.
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Description
Learn about the properties of white light and how colours are produced through combination and reflection. Discover how objects absorb and reflect different wavelengths of light.
