Wavefront | What is wavefront and its types?

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  • Опубліковано 1 тра 2017
  • A wavefront is a surface over which an optical wave has a constant phase. For example, When a stone is dropped in a still water, waves spread out along the surface of water in all directions with same velocity. Every particle on the surface vibrates. Such a surface which envelopes the particles that are in the same state of vibration is known as a wave front.
    The wave front at any instant is defined as the locus of all the particles of the medium which are in the same state of vibration.
    A point source of light at a finite distance in an isotropic medium
    (Isotropic medium is the medium in which the light travels with same speed in all directions.) emits a spherical wave front.
    A point source of light in an isotropic medium at infinite distance will give rise to plane wavefront.
    A linear source of light such as a slit illuminated by a lamp, will give
    rise to cylindrical wavefront.

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