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. The fainter beam of white light exiting to the upper right has been
reflected (without dispersion) off the first surface of the prism.]]
Light, or visible light, is electromagnetic radiation of a wavelength that
is visible to the human eye (about 400?700 nm). In a scientific context,
the word light is sometimes used to refer to the entire electromagnetic
spectrum. Light is composed of an elementary particle called a photon.
Three primary properties of light are:
· Intensity, or brightness;
· Frequency or wavelength and;
· Polarization or direction of the wave oscillation.
Light can exhibit properties of both waves and particles. This property is
referred to as wave-particle duality. The study of light, known as optics,
is an important research area in modern physics.
Speed of light and the moon, about 1.2 seconds.]]The sp
