Interference


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Interference
10106061011304InterferenceImagine a light wave that is like a very long sine wave. If you start at a crest and move an integral number of wavelengths, you will come to another crest. Such a wave is coherent. Laser beams have this property, and that is perhaps their most important characteristic. Sunlight, on the other hand, consists of lots of short segments of a sine wave, and the phase of one segment is not related to another. Two coherent light waves of the same wavelength may interfere. This means they can reinforce each other and produce a larger amplitude (constructive interference), or they may cancel each other …
Citation
Michael Browne: Schaum's Outline of Physics for Engineering and Science, Third Edition. Interference, Chapter (McGraw-Hill Professional, 2013), AccessEngineering Export