Asked in Uncategorized
How grating produces dispersion?
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Why must the slit width of a prism monochromator be varied to provide constant effective bandwidths but a nearly constant slit width provides cnstant bandwidth with a grating monochromator?
Prisms and gratings have different dispersive properties. Grating has a linear dispersion of wavelengths meaning the band on the focal plane varies linearly with the wavelength. Prisms are not linear, the shorter the wavelength the greater the dispersion. Thus, when a spectrum is being scanned, the dispersive device needs to rotates different amounts depending on whether it is prism or grating to focus light on the exit slit. If its grating, the slit width will need to be varied minimally; if it is a prism, the slit width will need larger changes as the dispersion gets greater.
Asked in Technology
What is Difference between prismatic spectrum and grating spectrum?
Grating spectrum is a spectrum produced as a result of diffraction, as by a grating.Whereas prismatic spectrum is a consequence of dispersion of light by a prism. In grating spectrum you also observe different orders of spectral lines which does not happen in prismatic spectrum. Hope this helps VIBHAV ZUTSHI B.Tech '13 IIT Kharagpur
Asked in Physics, The Difference Between
What is main difference between prism spectrum and grating spectrum?
Prism spectrum is formed due to DISPERSION but grating spectrum is formed due to DIFFRACTION. In prism spectrum we have only one order but in grating spectrum we can have second order too IN prism spectrum we have continuous spectrum but in gratings we have only line spectrum In prism spectrum red end will be closer to the direct ray but in grating spectrum violet end will be closer to the direct ray
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Asked in Science Experiments
What is the use of grating element in laser experiment?
Asked in Waves Vibrations and Oscillations
What are corresponding point of a diffraction grating?
Corresponding points are the successive points in adjacent slits which are separated by a distance of grating element. Grating element is the combined width of a ruling and slit in the grating. Denoted by symbol 'e'. e = 1/N N - number of slits or number of rulings or number of grating elements per unit length.
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Asked in Technology
Difference between prism spectrum and grating spectrum?
A prism bends light according to change in refractive index, which can be relatively small (typically a few percent from red to blue) and which varies in different ways for different materials. The prism material may also absorb some wavelengths. A grating bends light according to strict geometry, fairly independent of the material, and the bending is larger. From blue (say, 480nm) to red (around 640) you can get a 15 degree separation with a typical grating. The larger dispersion and the perfectly geometrical calculation of the turn (based on grating spacing and wavelength and initial angle) independent of material make gratings a superior solution for measurement devices.
Asked in Spectroscopy
Distinguish between grating spectra and prism spectra.?
Grating spectra is made of a series of step like material where the beam of light hits either the short face (echelle) or the long face (echellette) which disperses the beam into separate wavelengths. Prisms can be made in different ways but they theory is based on refractive index. The beam passes through the prism and the wavelengths disperse, where dispersion increases with shorter wavelength.