![]() When the waves meet the resulting wave will have the amplitude of the sum of the two interfering waves.ĭepending on the phase of the waves the interference can be constructive or destructive. When one wave comes into contact with another wave this is called interference. As a result the white stripe will be less hot. A white stripe painted on the pavement will reflect more of the light and absorb less. The black pavement becomes hot from absorbing the light waves and little of the light is reflected making the pavement appear black. One example of absorption is black pavement which absorbs energy from light. This vibration absorbs or takes some of the energy away from the wave and less of the energy is reflected. In this picture the unpolarized light wave travels through the filter and then is polarized along a single plane.Ībsorption is when a wave comes into contact with a medium and causes the medium's molecules to vibrate and move. Longitudinal waves, such as sound, cannot be polarized because they always travel in the same direction of the wave. Light waves are often polarized using a polarizing filter. The most colourful examples of diffraction are those involving light for example, the closely spaced tracks on a CD or DVD act as a diffraction grating to form the familiar rainbow pattern we see when looking at a disk.Polarization is when a wave oscillates in one particular direction. So it’s a good example of the diffraction of light. The setting sun appears to be red because of the diffraction of light from dust particles in the atmosphere.The rainbow pattern found on a CD/DVD/Vinyl.The rainbow pattern found on the hologram of your credit/debit card.Radio waves bend around buildings and hence, the reception is still good on the opposite side. Radio waves (specially AM) diffract when they come in contact with buildings. Diffraction can also be a concern in some technical applications it sets a fundamental limit to the resolution of a camera, telescope, or microscope. Sound waves can diffract around objects, which is why one can still hear someone calling even when hiding behind a tree. Ocean waves diffract around jetties and other obstacles. All these effects are a consequence of the fact that light propagates as a wave.ĭiffraction can occur with any kind of wave. When deli meat appears to be iridescent, that is diffraction off the meat fibres. ![]() The speckle pattern which is observed when laser light falls on an optically rough surface is also a diffraction phenomenon. A shadow of a solid object, using light from a compact source, shows small fringes near its edges. ![]() Diffraction in the atmosphere by small particles can cause a bright ring to be visible around a bright light source like the sun or the moon. This principle can be extended to engineer a grating with a structure such that it will produce any diffraction pattern desired the hologram on a credit card is an example. The most striking examples of diffraction are those that involve light for example, the closely spaced tracks on a CD or DVD act as a diffraction grating to form the familiar rainbow pattern seen when looking at a disc. The effects of diffraction are often seen in everyday 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. ![]()
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