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app:diffraction_grating
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app:diffraction_grating [2018/01/30 12:41] pklapetek |
app:diffraction_grating [2018/01/30 12:57] pklapetek |
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| ==== Transmission through single aperture ==== | ==== Transmission through single aperture ==== | ||
| + | {{:app:aperture.png?200 |}} | ||
| First, consider a single hole in an opaque screen - rectangular aperture. If a light is illuminating the screen on the other side a diffraction pattern is formed behind it (and can be seen on the screen located behind). With smaller ratio between aperture size and wavelength this effect becomes more pronouced and angular spacing between diffraction maxima is larger. | First, consider a single hole in an opaque screen - rectangular aperture. If a light is illuminating the screen on the other side a diffraction pattern is formed behind it (and can be seen on the screen located behind). With smaller ratio between aperture size and wavelength this effect becomes more pronouced and angular spacing between diffraction maxima is larger. | ||
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| If we consider x and y as axes on the screen where diffraction pattern is seen, the intensity space distribution varies as | If we consider x and y as axes on the screen where diffraction pattern is seen, the intensity space distribution varies as | ||
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| + | {{ :app:eq_aperture.png?300 |}} | ||
| where p and q are aperture dimensions, r is distance from aperture to screen center, A is related to incident field amplitude and k=2π/λ where λ is the incident light wavelength. | where p and q are aperture dimensions, r is distance from aperture to screen center, A is related to incident field amplitude and k=2π/λ where λ is the incident light wavelength. | ||
app/diffraction_grating.txt · Last modified: 2018/08/29 12:25 by pklapetek
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