They are a phenomenon that manifests when two rays of light of the same wavelength combine. They are a consequence of the wave nature of the light itself and of electromagnetic radiation in general.
In practice, if the two rays are matched with the phase waves, the light intensities add up; but if the two rays are outdated, so that the top of one coincides with the lower part of the other, the luminous intensities are canceled.
The interference phenomenon is caused artificially with devices invented by pioneers of optics such as Newton and Fresnel. In astronomy and astrophysics this phenomenon is used to assess meager angular measures, such as the separation between the components of a very narrow double star or the angular diameter of a star.
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