Basic knowledge about lighting

The scattering of light propagation in inhomogeneous medium, the countless desultorily interface will disorderly many times light reflection and refraction, this phenomenon is called scattering.

the diffuse reflection light and diffuse transmission when the light in a medium surface, the roughness on the surface of the medium and the wavelength of light wavelength close to or slightly greater than the time, the light will be scattered in all directions, scatter the light back to the original medium, called the diffuse reflection, have access to the media, is called the diffuse transmission

light polarization of the light waves have vertical light electric field in the direction of propagation, for each light, there is a is composed of field direction and the direction of propagation of plane, that is the polarization plane wave. Most of the light source the light is polarized light, the light waves of flat surface is messy. Only some transparent crystals on the surface of vibration in a particular direction of light transmission, through this kind of crystal light shone, referred to as the polarized light. Car windshields viewing lens against the glare of the camera and video cameras eyepiece are beneficial, such as light of the principle of vibration.

when two wavelength optical interference phenomenon, the same phase stationary wave, when they met with phase will overlap and paradoxical bit light waves cancel each other out, this phenomenon is the interference of light. Using light interference principle, the application in lighting, can produce light and shade and lighting effects.

the light around the obstacles of light diffraction phenomenon, at the edge of the bent is called diffraction of light spectrum analyzer is the use of light interference and diffraction principle.

light quantum theory of light fluctuation can perfectly describe the propagation of light, but cannot correctly explain the emission and absorption of light. So there is a quantum theory of light. When light or other forms of electromagnetic radiation emission and absorption, always contain division called quantum energy, a quantum is called a photon of light energy, it carries energy is proportional to its frequency.