Diffraction also occurs when a wave passes through a gap (or slit) in a barrier. Just thought the reference would be helpful just in case.I see, you're right. In diffusion, the solute molecules tend to get distributed in equal concentration all over.

I'm pretty sure that diffraction would refer to the way the wave reacts once passing through the slit; in other words it describes the motion of wave. If the transverse coherence length in the vertical direction is higher than in horizontal, the laser beam divergence will be lower in the vertical direction than in the horizontal.The ability of an imaging system to resolve detail is ultimately limited by,where λ is the wavelength of the light and,Two point sources will each produce an Airy pattern – see the photo of a binary star. It doesn't really matter in what direction you consider: the waves will spread out into the 'harbour' because the water at the harbour mouth is moving.From this way of thinking, you begin to wonder why the waves out at sea are so straight! In the case of Young's double slit experiment, this would mean that if the transverse coherence length is smaller than the spacing between the two slits, the resulting pattern on a screen would look like two single slit diffraction patterns.In the case of particles like electrons, neutrons, and atoms, the coherence length is related to the spatial extent of the wave function that describes the particle.The Airy disk around each of the stars from the 2.56 m telescope aperture can be seen in this,Wireless Communications: Principles and Practice, Prentice Hall communications engineering and emerging technologies series, T. S. Rappaport, Prentice Hall, 2002 pg 126.Letter from James Gregory to John Collins, dated 13 May 1673. This is incorrect. ).What is the principal cause of diffraction?Does a particle interact with the slit in diffraction from a single slit?Why do waves, specifically light, diffract through a slit?Huygen's principle and why can't we see atoms with light.Why a ship can't pass through its own wave?Why does the DFT of a diffraction pattern gives the corners of the aperture?Why does the intensity of light decrease as you move away from a particular point (described in question)?How do we understand transverse waves and polarization?Why are electromagnetic waves attenuated by thick barriers?If either party would "pack the Supreme Court", what would be stopping the next administration from just doubling (+1) the number of judges again?How can I draw two rolling circles with TikZ?Is this 230V steampunk metal robot lamp safe?Can airliners land with auto pilot at strong gusty wind?Why early single-chip CPUs didn't support multiplication instructions.How to remove all frequencies above a certain pitch with Audactiy?Tools from other disciplines useful to mathematics research?A question about the word 'blood' meaning 'a close relative'?How does a computer know which device is connected to the usb port?What is better: to have a modal open instantly and then load its contents, or to load its contents and then open it?How can I lower the gear ratio on my son's bike?What causes a fuse to blow, the current or the power?Is this lattice in the Tate module of an elliptic curve, coming from complex-analytic uniformization, stable under Frobenius?Trying to cross into Tijuana by foot without a passport?Is water an essential ingredient of alcohol based hand sanitizers?How certain are we that we have not accidentally sent life to other planets/moons?Why do oscilloscopes have such high sampling rates when the bandwidth is low?Challenger Shuttle: could the crew have survived?What should be the value change if pawns are doubled?Asking for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience. Your wavefront is made up of a nearly infinite number of these point sources and it is the superposition of the waves from these point sources that combine to create a uniform wavefront. Even punching out a hole in a thick sheet often leads to a thickening of the material at the edge.Again: you misunderstand the terms you are using. Each point in the plane is the source of a single wave. Well, that's not really what happens. @dmckee The pressure of a falling stone does not only go into the depth, but is distributed laterally in every elastic medium. But the basic idea; that "humps" push water away and "gulfs" pull it in, and that there is enough momentum to cause overshoot -- result in a similar effect. Reprinted in:Fresnel, Augustin-Jean (1816), "Mémoire sur la diffraction de la lumière" ("Memoir on the diffraction of light"),Fresnel, Augustin-Jean (1818), "Mémoire sur la diffraction de la lumière" ("Memoir on the diffraction of light"), deposited 29 July 1818, "crowned" 15 March 1819, published in,del in cylindrical and spherical coordinates,"A History of Physics in its Elementary Branches, including the evolution of physical laboratories. In the middle, there's a well-defined crest line, and you still get the straight pattern.