Optical Phenomen1

Optical Phenomen1 - respectively Plane polarized When the...

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Optical Phenomena Glossary for Optical Phenomena Coherent - Sources which produce light rays which have a constant phase difference (that may or may not be zero) are said to be coherent. The notion of a perfectly monochromatic source (one that produces a single frequency only) is an unattainable idealization, and any real light wave will contain a (perhaps very small) band of frequencies. The amount of time over which such a band of frequencies can be usefully approximated by a sinusoidal wave is called the coherence time. The distance light travels during this time, behaving in a predictable and sinusoidal way is called the coherence length of the source. The narrower the band of frequencies emitted, the longer the coherence length. Fringes - Interference and diffraction effects usually produce a series of alternately bright and dark regions. These regions are not sharply defined as the irradiance varies constantly with position. These regions of maximum and minimum irradiance are called bright and dark fringes
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Unformatted text preview: respectively. Plane polarized - When the electric field vector of a light oscillates in a single, fixed plane, constant in time, it is said to be plane polarized or linearly polarized. Plane of vibration - The plane containing the electric field vector and the vector k defining the direction of propagation. For a linearly polarized light wave, the plane remains fixed. Circularly polarized - This arises when the phase difference between the two component waves differ by a factor of ε = - Π /2±2 mΠ for right-circularly polarized light, and ε = Π /2±2 mΠ for left-circularly polarized light, and the amplitudes of the electric fields of the two waves are equal. In this case the electric field vector rotates around a the axis defined by the direction of propagation (clockwise for right-polarized and counterclockwise for left) at a constant angular frequency....
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