1.1 PARAMETERS AND UNITS USED TO DESCRIBE LIGHT
Light is an ultra high frequency electromagnetic wave. Light used for general illumination and imaging, which has a wide spectrum (includes wavelengths of many components) is called incoherent light, wherein interference is less likely, and focusing the light on a small spot is difficult. On the other hand, laser light, which is used as a light source for optical communication devices and optical disk storage, is a single wavelength spectrum, wherein interference can be strong, and focusing light at a wavelength-sized small spot is possible. This light posses different optical properties and is actually a collection of photons; the individual photons of ...
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