![]() ![]() It takes place because of the superposition of secondary waves, starting from two different wavefronts that must be obtained from a coherent source. When two waves combine and form another wave this phenomenon is called interference. It takes place because of the superposition of secondary waves starting from various parts of the same wavefront. Wave split at sharp edge or corners of the slit. The light source should be small or narrow.ĭifference between Diffraction and Interference Diffraction ![]() The amplitude and the frequency of both the waves should be the same. The light source should be monochromatic. So that the phase difference at the source remains constant. The first one is that the source should be coherent. There are a few conditions for interference. The amplitude of the resultant is less than the individual waves. The amplitude and energy of resultant waves are higher than individual waves.ĭestructive Interference: when two waves are propagated in the same direction with the same speed but out of phase, these waves form destructive interference. ![]() Then these waves undergo constructive interference. There are two types of interference.Ĭonstructive Interference: when two waves are propagated in the same direction with the same speed and in the same phase. The magnitude of amplitude depends on the type of interference. The phenomenon in which two waves of different amplitude are superimposed with each other and give a resultant wave with a new amplitude. We can see that the central fringe is brighter than the other fringes and it is wider than the other fringes in the experimental image given below. $\mathrm$įringe width of the central maxima is more than the other fringes and the intensity of all bright fringes are different and this can be seen in the image attached given below. Higher will be the wavelength of the light wave more will be the diffraction. Thurth,my own, SingleSlitDiffraction, CC BY-SA 3.0 Condition for Diffractionĭiffraction occurs when the size or width of an obstacle is less than the equivalent of the wavelength of the light beam. There are two types of diffraction.įresnel’s class: The distance between the source and the aperture or aperture and screen is finite, this kind of diffraction is called fresnel’s class.įraunhofer class: In this type of diffraction, the screen is at an infinite distance from the slit.įig:1 Diffraction pattern using single slit for example, the CDs and DVDs show a rainbow pattern when light falls on them. We can easily observe the phenomenon of diffraction in our daily life. The pattern forms in this process are known as diffraction patterns. It is a process in which waves or light rays are expanding by passing through an edge of an obstacle. Whereas interference fins the applications in the radio transmission of the signals. It finds applications in the study of biological macromolecules. After this various Scientists make different attempts to explain these terms in their way. In classical physics, the term diffraction is firstly explained by using the Huygen-Fresnal principle. In this tutorial, we will discuss the two important phenomena i.e. These all phenomena are related to the optical phenomenon of light. In our day-to-day life we observe various phenomena like after the rain a rainbow is formed in the sky, splitting of white light into seven colors, and when water falls on petrol it also shows different colors. ![]()
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