Fresnel diffraction

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Fresnel diffraction

[frā′nel di′frak·shən]
(optics)
Diffraction in which the source of light or the observing screen are at a finite distance from the aperture or obstacle.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The Fresnel pattern was slightly mushy outside of focus, but I have seen this even in the best refractors; what truly matters is what the star looks like when in focus.
Figure 14 shows the enveloping trace of the difference between gain maxima of the two radiation patterns (Fresnel pattern and metallic surface pattern), defined by Eq.
For [absolute value of z] [much greater than] [lambda], the forward field is the same as in FresneFs theory and the reverse field is a mirror image of the forward Fresnel pattern.