Help


[permalink] [id link]
+
Page "Diffraction" ¶ 98
from Wikipedia
Edit
Promote Demote Fragment Fix

Some Related Sentences

light and is
The enormous changes in world politics have, however, thrown it into confusion, so much so that it is safe to say that all international law is now in need of reexamination and clarification in light of the social conditions of the present era.
The voice is light in timbre, with a rough edge that corresponds to his visage.
It is because there is not only darkness but also light that our situation becomes inexplicable.
The portrait that had developed, fragmentarily but consistently, was the portrait of a man to whom serious thinking is alien enough that the making of a decision inhibits, when it does not forestall, any ability to review the decision in the light of new evidence.
Ptolemy's problem is to forecast where, against the inverted bowl of night, some particular light will be found at future times.
The distances of these points of light is a problem he cannot master, beyond crude conjectures as to the orderings of the planetary orbits viewed outward from earth.
Trevelyan centers too exclusively on Bright, is insufficiently appreciative of the views of Bright's opponents and critics, and makes light of the genuine difficulties faced by Peel.
The light at that time is a benediction.
In light of the scholarly reappraisals engendered by the higher criticism this is a most remarkable statement, particularly coming from one who was well known for his antifundamentalist views.
At the left is a pair of dressy straw pumps in a light, but crisp texture.
Far from being irrelevant to the ecumenical task, the Pontiff believes that a revivified Church is required in order that the whole world may see Catholicism in the best possible light.
These cases in which light is already visible at the other end of the tunnel are ones which over the next few years will absorb the bulk of our capital assistance.
A flashlight or electric lantern also should be available for those periods when a brighter light is needed.
At that time consideration will be given to whether in the light of the United States supplies of rice available for Title 1, disposal, India's production, consumption and stocks of food grains, other imports from the United States and countries friendly to the United States, India's storage capacity, and other related factors, any increase would be possible in the portion of the total rice programmed which is currently planned for procurement during the first year.
Essentially, the question presented for decision in the present Daytime Skywave proceeding is whether our decision ( in 1938-1939 ) to assign stations on the basis of daytime conditions from sunrise to sunset, is sound as a basis for AM allocations, or whether, in the light of later developments and new understanding, skywave transmission is of such significance during the hours immediately before sunset and after sunrise that this condition should be taken into account, and some stations required to afford protection to other stations during these hours.
It is a flavor that might take a little getting used to -- not because it is unpleasant, but because the flavor is hard to define in the light of our experience with other fruits.
It is a simple task to haul a boat fifty or one hundred miles to a lake or reservoir on the new, light, strong, easy-to-operate trailers which are built to accommodate almost any kind of small boat and retail from $100 to $2,000.
The Deerstalker points with the ease, speed and precision of a fine imported double shotgun, and its trigger pull is light and sharp.
Just after sunset is a good time to record the city lights in color since you get a `` fill-in '' light from the sky.

light and focused
This new style was focused on changing the direction of light in the painting.
The reflected light, varying in intensity according to the light and dark areas of the document, was focused on a photocell so that the current in a circuit varied with the amount of light.
The dispersed spectrum of light was focused on detectors of indium antimonide and silicon.
Vertical light rays of the lamp are redirected into a horizontal plane, and horizontally the light is focused into one or a few directions at a time, with the light beam swept around.
The invention of the Fresnel lens ( pronounced ) in 1822 by French physicist Augustin-Jean Fresnel revolutionized lighthouses in the 19th century, focusing 85 % of a lamp's light versus the 20 % focused with the parabolic reflectors of the time.
A helium-neon ( HeNe ) laser uses an electrical discharge in the helium-neon gas mixture, a Nd: YAG laser uses either light focused from a xenon flash lamp or diode lasers, and excimer lasers use a chemical reaction.
The film was light on plot and focused more on the comedy and musical numbers.
Parabolic reflectors resolve this, allowing incoming parallel rays ( for example, light from a distant star ) to be focused to a small spot ; almost an ideal point.
Hertz changed the frequency of his radiated waves by altering the inductance or capacity of his radiating conductor or antenna, and reflected and focused the electromagnetic waves, thus demonstrating the correctness of Maxwell's electromagnetic theory of light.
Inspired by European Impressionism, the artists incorporated Western elements such as the effects of light and the expression of individual moods but focused on strictly traditional themes.
However, gamma-ray bursts are thought to be highly focused explosions, with most of the explosion energy collimated into a narrow jet traveling at speeds exceeding 99. 995 % of the speed of light.
In the fifth century B. C., the Chinese philosopher Mo Ti noted that a pinhole can form an inverted and focused image, when light passes through the hole and into a dark area.
Ananda Marga counts hundreds of missions around the world through which its members carry out various forms of selfless service on Relief ( The social welfare and development organization under AMPS is Ananda Marga Universal Relief Team, or AMURT., Education and women's welfare ( The service activities of this section founded in 1963 are focused on: 1-Education: creating and managing primary, post primary and higher schools, research institutes etc., 2-Relief: creating and managing children's and students ' homes for destitute children and for poor students, cheap hostels, retiring homes, academies of light for deaf dumb and crippled, invalid homes, refuge reabilitation etc., 3-Tribal: tribal welfare units, medical camps etc., 4-Women's welfare: women welfare units, women's homes, nursing homes etc.
Since the focal length f of a lens is dependent on the refractive index n, different wavelengths of light will be focused on different positions.
Axial aberration occurs when different wavelengths of light are focused at different distances from the lens, i. e. different points on the optical axis ( focus shift ).
In a confocal laser scanning microscope, a laser beam passes through a light source aperture and then is focused by an objective lens into a small ( ideally diffraction limited ) focal volume within or on the surface of a specimen.
In these cases, the highly focused beam of electrons impinges on a sample and induces it to emit light from a localized area.
In statistics, a meta-analysis refers to methods focused on contrasting and combining results from different studies, in the hope of identifying patterns among study results, sources of disagreement among those results, or other interesting relationships that may come to light in the context of multiple studies.
A high-intensity light source behind the film strip projected the image of each glyph through an optical system, which focused the desired letter onto the light-sensitive phototypesetting paper at a specific size and position.
As a result, a part of the light rays are focused on the retina and the other part is focused behind it or in front of it.

light and point
This tied in closely with the current attempt to upgrade state-owned cars to the extent that vehicles are not retained beyond the point where maintenance costs ( in light of depreciation ) become excessive.
Starting with the room completely blacked out, as it was when we came in, he unerringly fixed things so that the whole place was bathed in the maximum of light without at any point admitting even so much as a crack of glare.
In an imaging system, it occurs when light from one point of an object does not converge into ( or does not diverge from ) a single point after transmission through the system.
The elementary theory of optical systems leads to the theorem: Rays of light proceeding from any object point unite in an image point ; and therefore an object space is reproduced in an image space.
The course of the rays in the meridional section is no longer symmetrical to the principal ray of the pencil ; and on an intercepting plane there appears, instead of a luminous point, a patch of light, not symmetrical about a point, and often exhibiting a resemblance to a comet having its tail directed towards or away from the axis.
If, in an unsharp image, a patch of light corresponds to an object point, the center of gravity of the patch may be regarded as the image point, this being the point where the plane receiving the image, e. g., a focusing screen, intersects the ray passing through the middle of the stop.
The pop science TV program MythBusters attempted to model Archimedes ' feat by using mirrors to ignite a small wooden boat covered with tar, with only partial success — they found it too difficult to focus light from their hand-held mirrors onto a point small enough to ignite the boat.
Once the ray either encounters a light source, or more probably once a set limiting number of bounces has been evaluated, then the surface illumination at that final point is evaluated using techniques described above, and the changes along the way through the various bounces evaluated to estimate a value observed at the point of view.
The optical basis of the simulation is that some diffused light from a given point on a given surface is reflected in a large spectrum of directions and illuminates the area around it.
By connecting outward light to inward light, via an interaction point, this equation stands for the whole ' light transport ' — all the movement of lightin a scene.
Said more simply, areas with a higher density and repetition of atom order tend to reflect more light toward one point in space when compared to those areas with fewer atoms and less repetition.
Light incident at a given point in the space downstream of the slit is made up of contributions from each of these point sources and if the relative phases of these contributions vary by 2π or more, we may expect to find minima and maxima in the diffracted light.
In its mathematical form it is analogous to the description of a physical wave, but its " crests " and " troughs " indicate levels of probability for the occurrence of certain phenomena ( e. g., a spark of light at a certain point on a detector screen ) that can be observed in the macro world of ordinary human experience.
Each element may only be influenced by events which are located in the backward light cone of its point in spacetime ( i. e. the past ).

1.301 seconds.