![]() ![]() I have not read about this being observed for electrons. To make this statement more quantitative, consider a diffracting object at the origin that has a size a variable as in the 1-slit diffraction and bracket the result.Reading about Young's double slit experiment for electrons, it is stated that the diffraction pattern is observed when both slits are open but not for a single slit (I suppose this is equivalent to there being no diffraction pattern when an observer is placed to measure which slit the electron passes through).Īnd yet a diffraction pattern is observed for light passing through a single slit. It is mathematically easier to consider the case of far-field or Fraunhofer diffraction, where the point of observation is far from that of the diffracting obstruction, and as a result, involves less complex mathematics than the more general case of near-field or Fresnel diffraction. ![]() The problem of calculating what a diffracted wave looks like, is the problem of determining the phase of each of the simple sources on the incoming wave front. The fourth figure, for example, shows a comparison of a double-slit pattern with a pattern formed by five slits, both sets of slits having the same spacing between the center of one slit and the next. When the diffracting object has a periodic structure, for example in a diffraction grating, the features generally become sharper.The diffraction angles are invariant under scaling that is, they depend only on the ratio of the wavelength to the size of the diffracting object.(More precisely, this is true of the sines of the angles.) In other words: the smaller the diffracting object, the wider the resulting diffraction pattern, and vice versa. ![]()
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