A thin film of soap will shine with all the colours of the rainbow. But why?
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A diffraction grating shows the distinct line pattern of a plasma.
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A convincing demonstration of how fibre-optics work using a stream of water and a laser.
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When the two polarizers are set 90 degrees to each other, no light passes through.
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When a laser is shone through diffraction gratings, unique patterns can be observed.
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