![]() ![]() Interference patterns due to the superposition of the incident wave and the diffracted wave are clearly seen just before the barrier (bottom left of the animation). The animation below illustrates how a travelling wave emitted from the upper left corner by, say, an aeroplane is diffracted by a sound barrier erected to shield homes from the traffic noise. An example of diffraction phenomena is given by the spreading of waves around an obstacle. Diffraction occurs if a wave encounters an object and if the wavelength is of the same size (or greater than) the object size. That principle is none other than the principle of the diffraction of light.The spreading of waves when they pass through an opening, or around an obstacle into regions where we would not expect them, is called diffraction. ![]() So next time you see a rainbow pattern on your CD/DVD, try to understand the principle of the phenomenon behind it. You might not even be aware of the fact because you are so accustomed to the phenomenon. So you see that you see several examples of diffraction in your very own daily life. There are also several other insects having very fine regular structures where diffraction of light occurs. The iridescent color of peacock feathers,.There are various other examples of diffraction grating present in nature that are: This is mainly due to the diffraction of light from the meat fibers. Luncheon meat appears to be a little iridescent. Speaking into a microphone is a good example of diffraction of sound in daily life. The setting sun appears to be red because of the diffraction of light from dust particles in the atmosphere. The setting sun is also a good example of the diffraction of light. You’ll see that your friends inside your classroom will hear you speak. A simple way of explaining this phenomenon is to stand and talk in the hallway adjacent to your classroom. The sound spreads as well as fills the room on the other side of the door. Radio waves bend around buildings and hence, the reception is still good on the opposite side.ĭiffraction of sound waves occurs when these waves pass through a door. Radio waves (specially AM) diffract when they come in contact with buildings. This effect is much less defined than the ones seen in a CD/DVD but it actually happens which is our point here. A standard vinyl record, when seen from a low angle perpendicular to the grooves, might actually provide a rainbow-like effect. The similar effect discussed above can also be seen in a standard vinyl record. The closely spaced tracks on a CD/DVD act as a form of diffraction grating to form the rainbow pattern. The surface has the application of a thin layer of metal that makes the pits more visible. One surface of a compact disk/DVD has many tiny pits in the plastic that are arranged within concentric rings. This rainbow pattern effect is mainly a side effect of their manufacture. ![]() The rainbow pattern that you see on compact disks or DVDs is also a good example of diffraction of light. You’ll see the seven colors of the rainbow, on the hologram of a credit card/ debit card or other similar cards that exhibit such holograms. Let’s go through them without further ado. We have highlighted a few examples of diffraction of light/sound/radio in our daily life. This phenomenon is basically the bending of light around the corners of an aperture or an obstacle. Diffraction refers to those phenomena that occur when a wave encounters an obstacle. ![]()
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