What do white and black mean in terms of wavelengths of light?
White light contains wavelengths of all colours.
Black is the absence of light.
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What does transparent mean?
A transparent material lets all light through.
For example, a glass window.
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What does translucent mean?
A translucent material lets some light through.
For example, a plastic bottle, or sunglasses.
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What does opaque mean?
A opaque material lets no light through.
For example, a brick or piece of wood.
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What are the 3 primary colours of light?
Red
Blue
Green
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Why do objects appear a certain colour?
For example, why does an orange bag appear orange?
An object's colour depends on the wavelengths of light that it reflects.
For example, an orange bag appears orange because it reflects orange light.
For translucent objects, it also depends on which colours they transmit.
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How does a primary colour filter work?
A primary colour filter absorbs all wavelengths of light, except the colour of the filter itself.
For example, a red filter will only transmit red light, and absorb all other wavelengths.
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