The views expressed in the project do not necessarily reflect the views of The Office for Learning and Teaching. He considered an atom excited by a certain amount of energy and what would happen if that atom were hit by a photon with the same amount of energy. As we have seen previously, light obeys the equation c f, where c 3.00 × 10 8 m/s is the speed of light in vacuum, f is the frequency of the electromagnetic wave in Hz (or s 1 ), and is its wavelength in m. Wave-Based Applications of Light In 1917, Albert Einstein was thinking about photons and excited atoms. 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. Diffraction and Interference We know that visible light is the type of electromagnetic wave to which our eyes responds. Single slit diffraction, diffraction gratings.ĭownloads (thumbnails at 50% of size of animation) Recreating a hologram: coherence beam and hologram plate. In both cases, the phasors add to zero, after rotating through rad for m 1 and rad for m 2. The phasor diagrams for the first two zeros of the diffraction pattern are shown in Figure and Figure. The intensity of the maximum is then where. ![]() X-ray diffraction.įorming a hologram: beam splitter, object and reference beams, interference at the film. The intensity of the light can be obtained using the relation from Electromagnetic Waves. Diffraction requires wavelengths less than 0.1 nm. The lens, considered as a circular aperture with diameter D, produces a. The atomic lattice as a diffraction grating. In reality, the pattern in the lenss image plane is complicated by diffraction effects. When is the eye diffraction limited? The resolution of telescopes. Resolving two point sources: Rayleigh's criterion. Diffraction pattern from a circular aperture. 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. ![]() The hydrogen spectrum and the origins of quantum mechanics. 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. Shadows and beams with water waves of short wavelength. Diffraction, shadows, beams, Huygens' construction.ĭiffraction of light and sound.
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