Support for this project website has been provided by The Office for Learning and Teaching, which is part of the Department of Industry, Innovation, Science, Research and Tertiary Education. This phenomenon is known as diffraction of the light, and occurs when a light wave passes very close to the edge of an object or through a tiny opening, such as a slit or aperture. Single slit diffraction, diffraction gratings.ĭownloads (thumbnails at 50% of size of animation) Recreating a hologram: coherence beam and hologram plate. X-ray diffraction.įorming a hologram: beam splitter, object and reference beams, interference at the film. The most colorful 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. Diffraction requires wavelengths less than 0.1 nm. The effects of diffraction can be regularly seen in everyday life. The atomic lattice as a diffraction grating. When is the eye diffraction limited? The resolution of telescopes. Resolving two point sources: Rayleigh's criterion. On tilting the crystal holder to one side or the.
Diffraction pattern from a circular aperture. When the sound wave is exactly normal to the incident light, the diffraction pattern disappears altogether. Rayleigh criterion and the Airy disc: Aperture and resolutionĬircular apertures in optics. A modern recreation of Arago's experiment. The bright dot at the centre of the shadow: Poisson's argument against the wave nature of light. When light is irradiated onto a diffraction grating, the effect of the grooves causes a diffraction of light, which allows the incident light to be divided according to its wavelength. The hydrogen spectrum and the origins of quantum mechanics. In this paper we discuss the diffraction pattern resulting from the propagation of light past an opaque obstacle with a circular cross section. A diffraction grating is an optical element fabricated on a glass substrate with finely spaced grooves at equal intervals.
Continuous spectra and line spectra, absorption and emission spectra. Young's experiment with finite slit width: I q shows both interference and diffraction effects.Ī light-hearted discussion to illustrate why we don't notice quantum interference in everyday life.Īdding phasors with 2, 3, 4 and many slits: Diffraction gratings. Young's experiment with finite slits.ĭiffraction from a single slit:Huygens' construction. X-ray, neutron and electron diffractionĭiffraction from a single slit. A single slit produces an interference pattern characterized by a broad central maximum with narrower and dimmer maxima to the sides. Shadows and beams with water waves of short wavelength. 4.2: Single-Slit Diffraction Diffraction can send a wave around the edges of an opening or other obstacle. Diffraction, shadows, beams, Huygens' construction.ĭiffraction of light and sound.
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