diffraction

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diffraction

 [dĭ-frak´shun]
the bending or breaking up of a ray of light into its component parts.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

dif·frac·tion

(di-frak'shŭn),
Deflection of the rays of light from a straight line in passing by the edge of an opaque body or in passing an obstacle of about the size of the wavelength of the light.
[L. dif- fringo, pp. -fractus, to break in pieces]
Farlex Partner Medical Dictionary © Farlex 2012

dif·frac·tion

(di-frak'shŭn)
Deflection of the rays of light from a straight line in passing by the edge of an opaque body or in passing an obstacle of about the size of the wavelength of the light.
[L. dif- fringo, pp. -fractus, to break in pieces]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

diffraction

Deviation of the direction of propagation of a beam of light, which occurs when the light passes the edge of an obstacle such as a diaphragm, the pupil of the eye or a spectacle frame. There are two consequences of this phenomenon. First, the image of a point source cannot be a point image but a diffraction pattern. This pattern depends upon the shape and size of the diaphragm as well as the wavelength of light. Second, a system of close, parallel and equidistant grooves, slits or lines ruled on a polished surface can produce a light spectrum by diffraction. This is called a diffraction grating. See Airy's disc; diffraction fringes; Maurice's theory.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
are mainly NLOS scenarios, with high influence of diffractions.
The agreement between the predictions for the path loss is more notable in the case of Ottawa, where the 3D ray-tracing propagation model based on image theory was applied, and less so for Cali and Valencia, where a 3D ray-tracing propagation model based on a brute-force algorithm or ray launching, including diffractions over rooftops, was applied.
Previously the H-plane pattern has been computed using slope diffraction as the regular first-order diffraction in this plane is zero, but only over a dynamic range of 0-40dB.
The geometrical optics method is briefly reviewed in Section 2, followed by a detailed description of the Uniform Theory of Diffraction in Section 3.
Generally speaking, odd-odd polyamides are assumed to be in the [gamma]-form at room temperature, characterized by one signal or two close diffractions at spacings in the range of 0.41-0.42 nm.
The measured data were used to evaluate the diffraction loss prediction and train the neural network using training algorithm.
In this paper, an equalizing Dammann vortex grating (EDVG) is proposed by suppressing the even and zero diffraction order, which can be used to realize the uniform regulation of diffracted light intensity.
In addition, the refilled CLC template grating shows different diffraction efficiencies for left- and right-handed circular polarization (LCP and RCP, respectively) in reflection and transmission modes.
However, due to the small scale of the fault and the appear wave impedance difference between coal seam and surrounding rock (the average density and P-wave velocity of coal seam and surrounding rock are respectively as: [rho]1=1400Kg/m3, V1=2000m/s; [rho]2=2800Kg/m3, V2=3500m/s), the obvious diffraction could be formed in the process of seismic advanced detection in coal roadway, as shown in Figure 2.
Regardless of the number of spikes, the amount of diffraction depends on the total area of the primary mirror obstructed by the spider vanes.