Saturday, 30 June 2018

WAVE OPTICS NOTE BY PLANCESS

In physics, physical optics, or wave optics, is the branch of optics that studies interference, diffraction, polarization, and other phenomena for which the ray approximation of geometric optics is not valid.


This usage tends not to include effects such as quantum noise in optical communication, which is studied in the sub-branch of coherence theory. Huygens considered light to be a wave. He envisioned a wave crest advancing by imagining each point along the wave crest to be source point for small, circular, expanding wavelets, which expand with the speed of the wave. The surface tangent to these wavelets determines the contour of the advancing wave. Figure 1 illustrates Huygens' construction for a plane wave (a) and for a spherical wave (b).

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