Bright and dark fringes result from diffraction and interference when light passes through a single slit or double slits. Fringe patterns increase as the number of slits is increased, and it is observed that the bright lines become sharper (narrower) and the dark lines broader. The intensity of the lines is less when the light has to pass through many narrow slits, but even so, the sharp lines are useful in optical analysis of light sources and other applications. As a result, arrangements of large number of parallel, closely spaced slits are fashioned in the form of diffraction gratings.

Since nature exhibits a great deal of symmetry, the French physicist Louis de Broglie thought that there might be a wave – particle symmetry. That is, if light sometimes behaves like a particle, perhaps material particles , such as electrons, also had wave properties. In 1924, de Broglie put forth a hypothesis that a moving particle has a wave associated with it. He proposed that the wavelength of a material particle was related to the particle’s momentum by an equation similar to that for a photon.

Bu 2 çeviriye yardım edecek var mı?