Characteristics of light

Illustrator Draftsman 3 & 2 - Volume 3 Executionable Practices
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Light, Continued Characteristics No one completely understands the nature of light. However, two theories of of light light are used to explain light characteristics. The two theories of light are referred to as the quantum theory and the wave motion theory. QUANTUM THEORY: The quantum theory of light applies to X-ray, radiation, and photoelectricity. This theory states that light is a steady stream of high-speed particles and that all light sources send out a stream of these particles. Each particle of light (quantum) is referred to as a photon. WAVE MOTION THEORY: The wave motion theory of light involves reflection, absorption, transmission, and polarization of light. Wave motion In the wave motion theory of light, light, wavelength, speed, and frequency theory are important but interrelated characteristics. The wave motion theory is the theory that affects Illustrator Draftsman the most. LIGHT: Light stimulates the perception of sight. White light is made of equal intensities of all wavelengths within the visible spectrum. What we see as color is light of a particular wavelength. WAVELENGTH: Wavelength is the chief determinant of perceived color. A wavelength is defined as the distance from the crest of one wave to the crest of the next wave. Wavelengths are measured in nanometers (nm) which are equal to one millionth of a millimeter. Light travels in a straight line, and when it encounters an object or enters a new medium, say water, it may be reflected, absorbed, or transmitted. SPEED: The speed of light is constant until it passes through a new medium, such as water, air, or glass. The speed of light is the product of wavelength multiplied by the frequency. Dividing the frequency by the (constant) speed of light results in approximate wavelength. FREQUENCY: Frequency is the number of wavelengths passing a given point in 1 second. Continued on next page 2-5

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