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- The speckle pattern which is observed when laser light falls on an optically rough surface is also a diffraction phenomenon. When deli meat appears to be iridescent, that is diffraction off the meat fibers. All these effects are a consequence of the fact that light propagates as a wave. Diffraction can occur with any kind of wave.
en.wikipedia.org/wiki/Diffraction
Dec 4, 2018 · The occurrence of diffraction can be summarized as the wave fronts that are parallel to the incoming wave fronts are continuing to propagate as it is, but the edges of the transmitted wave produce secondary wave fronts that are the observed, diffraction effect.
- optics
Light will diffract around anything, including a block. We...
- optics
Visible light of wavelength 550 nm falls on a single slit and produces its second diffraction minimum at an angle of 45.0° relative to the incident direction of the light. What is the width of the slit?
Light will diffract around anything, including a block. We simply don't observe this diffraction because most blocks are very large compared to the wavelength of light. One historically-famous example of diffraction around an object is Poisson's spot, in which diffraction around a circular disk is easily observed.
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.
Since the wavelengths of visible light range from approximately 390 to 770 nm, most objects do not diffract light significantly. However, situations do occur in which apertures are small enough that the diffraction of light is observable.
Diffraction gratings work both for transmission of light, as in Figure \(\PageIndex{3}\), and for reflection of light, as on butterfly wings and the Australian opal in Figure \(\PageIndex{4a}\). Natural diffraction gratings also occur in the feathers of certain birds such as the hummingbird.
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Readable Surface of a CD: The readable surface of a Compact Disc includes a spiral track wound tightly enough to cause light to diffract into a full visible spectrum. Some bird feathers use natural diffraction grating which produce constructive interference, giving the feathers an iridescent effect.
