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How the world works: lights, colours and lasers. Light. It is a set of electromagnetic waves, perceived by the human eye. It is composed of photons. Its speed is the highest known to man. Electromagnetic spectrum. It is a set or a range of electromagnetic waves, which are ordered by frequency and wavelength. Colours. Colours are visual perceptions; we interpret them through the retina of our eyes. Colour is the visible part of the spectrum. Lasers. Lasers are devices that augment light radiation. This one emits radiation with a single frequency and wavelength.

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