![]() 'Diffraction of a plane wave at a slit whose width is several times the wavelength' Im trying to look at slits SMALLER than the wavelength. Diffraction can occur by only one wave whereas at least two waves are required to interfere to produce an interference pattern. I'll not get into a deeper level or full description but the reason still turn out to be the superposition of wave functions. Although there will be no regions where extinction occurs in the way that this would happen for wider apertures. Talking in term of Quantum Electrodynamics : ![]() That means that the net amplitude caused by two or more waves traversing the same space is the sum of the amplitudes that would have been produced by the individual waves separately. When this is true, the superposition principle can be applied. In many cases (for example, in the classic wave equation), the equation describing the wave is linear. In any system with waves, the waveform at a given time is a function of the sources (i.e., external forces, if any, that create or affect the wave) and initial conditions of the system. The superposition principle, also known as superposition property, states that, for all linear systems, the net response caused by two or more stimuli is the sum of the responses that would have been caused by each stimulus individually. Why waves follow the superposition principle? Hence, by considering each star as a circular slit and applying the well known theory of wave diffraction, we can evaluate the expected diffraction patterns on the observer plane. State the essential condition for diffraction of light to occur. This and the other two questions can now be reduced to the question. Physics Multiple Choice Questions on Wave Optics Diffraction. One consequence of diffraction is that sharp shadows are not produced. There is little or no real distinction between this phenomenon and the phenomenon of interference both are the product of the superposition of several wavelets. Diffraction takes place with sound with electromagnetic radiation, such as light, X-rays, and gamma rays and with very small moving particles such as atoms, neutrons, and electrons, which show wavelike properties. For discussion of the phenomenon as encountered in other types of waves See. Roughly speaking, the wave will bend around an obstacle, thereby forming a fringe pattern in what might otherwise be assumed to be the region of the uniform geometrical shadow. Some important differences that occur with microwaves will also be mentioned. This is because sound waves undergo diffraction, bending and spreading as they go through the doorway between the two rooms. The essential feature of diffraction is a deviation from rectilinear propagation arising when a wave is obstructed in some way.
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