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Wave Properties of Light. Interference.

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Uploaded on Nov 29, 2010

Wave Properties of Light. Interference.Such phenomena as interference, diffraction and dispersion of light determine the wave properties of light.Interference of light means the coherent light waves overlap. As a result in some places the light is minimum intensive, while in the other place it can be maximum intensive. Besides, the light energy is shifted in space.The main condition for observing interference of waves is their coherence.Light waves are called coherent, if their phase difference remains constant over time.The general principle of interference can be put as follows: it is necessary to ensure that the waves from each atom overlap. Each wave emitted by an individual atom is coherent with itself, since it is a piece of a sine wave. If such waves are imposed on themselves, interference can be observed. Thus, the first and overall rule to observe light interference is as follows:The light beam coming from one source should be in some way divided into two or more beams (the beams will be coherent with each other), and then get them to overlap.The maximum waves intensity will occur at points where the following condition is fulfilled:There will be the minimum intensity at the points where the following condition is fulfilled:The phenomenon of light interference is widely used in modern technology. For example, it is used for the"enlightened" optics.To reduce light losses in optical devices all glass items that light goes through are covered by film with the refractive index less than the refractive index of glass. The film thickness is a quarter of the wavelength.Interference is also widely used in spectral analysis for accurate measurement of distances and angles in refractometry, in matters of surfaces quality control, to make filters, mirrors, reflective coatings, etc. Holography is based on the phenomena of light interference.

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