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This picture needs to be done properly - impossible with ascii source | [ o | [ | [ double- screen slit |
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http://www.wikipedia.com/images/uploads/doubleslit1.png |
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The source must be polarized? or have significantly resolved parts in the same plane. |
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The source must be polarised or have significantly resolved parts in the same plane. |
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The width of the slits is usually slightly smaller than the wavelength (λ) of the light; this allows the slits to be treated as point-sources of spherical waves, and reduced the effects of single slit diffraction on the results. |
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The white bands observed on the screen happen when the light has interfered constructively - where a crest of a wave meets a crest. The dark regions show destructive interference - a crest meets a trough. If two light rays have travelled the same distance or their distances are both multiples of the wavelength, this is the cause of constructive interference. If, however, their distances are not multiples of the wavelength then dark regions are observed - destructive interference. |
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The bright bands observed on the screen happen when the light has interfered constructively - where a crest of a wave meets a crest. The dark regions show destructive interference - a crest meets a trough. If two light rays have travelled the same distance or their distances are both multiples of the wavelength, this is the cause of constructive interference. If, however, their distances are not multiples of the wavelength then dark regions are observed - destructive interference. |
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λ / s = x / D |
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:λ / s = x / D |
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It has been said that all the important principles of quantum theory can be demonstrated in the double-slit experiment. Due to Wave-Particle duality, even if single photons were shot through the gap they would interfere with themselves and produce an interference pattern. /talk? |
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It has been said that all the important principles of quantum theory can be demonstrated in the double-slit experiment. Due to Wave-Particle duality, even if single photons were shot through the gap they would interfere with themselves and produce an interference pattern. The experiment can also be performed with electrons, and shows similar results, illustrating the wave-like nature of matter. |
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