The electromagnetic spectrum
Visible light is only a small section of electromagnetic radiation which produces a sensation of brightness and color in the human eye.
Electromagnetic radiation is a form of energy. The spectrum of such radiation provides information on its energy composition. The entire spectrum of electromagnetic radiation ranges from X-ray radiation at the high-energy, short-wave end to radio waves at the low-energy, long-wave end.
Radiation and human perception
Our perception of light is essentially characterized by its prismatic breakdown into its spectral components.
Our brain assigns particular colors to these different components of the light spectrum.
The speed of light is the speed at which light travels in a vacuum. In fact, all electromagnetic radiation travels at this speed. It is approximately 300.000 km/s. Light covers the 150 million km from the sun to the earth in about eight minutes.
Spectrum
Light is taken to mean the electromagnetic radiation that the human eye can perceive. This is the radiation between the wavelengths of approximately 380 nm and 780 nm.
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Eye
The eye is an optical system designed to create images on the retina. Its various components, such as the cornea, the aqueous humour, the iris, the lens and the vitreous humour, combine to enable the eye to react quickly and easily to different lighting levels.
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