diffraction grating physics
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SP212 Lab: Ten Diffraction Version: April, 2014 Page 1 of 7 Physics II Lab 10 SP212 Diffraction Gratings I. Introduction A. A diffraction grating consists of a large number of equally spaced parallel slits. When light is incident on a grating, the light from each slit
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Experiment 15: The Diffraction Grating . Diffraction gratings are used to make very accurate measurements of the . wavel~ngth . of light. In theory, they function much the same as two slit apertures (see Experiment 9). However, a diffraction grating has many slits, rather than two, and the slits are very closely spaced •.
Diffraction is the spreading out of waves as they pass through an aperture or around objects. It occurs significantly when the size of the aperture or obstacle is of similar linear dimensions to the wavelength of the incident wave.
In optics, a diffraction grating is an optical component with a periodic structure that splits and diffracts light into several beams travelling in different directions. The emerging coloration is a form of structural coloration. The directions of these beams depend on the spacing of the grating and the wavelength of the light so that the grating acts as the dispersive element.
“The diffraction grating is a useful device for analyzing light consists of a large number of equally spaced parallel slits.”Its working principle is based on the phenomenon of space between lines act as slits and these slits diffract the light waves thereby producing a large number of beams which interfere in such a way to produce spectra.
Diffraction by a grating can be visualized from the geometry in Figure 2-1, which shows a light ray of wavelength λ incident at an angle α and diffracted by a grating (of groove spacing d, also called the pitch) along angles βm. These angles are measured from the grating normal, which is the dashed
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THE DIFFRACTION GRATING SPECTROMETER Purpose a. To study diffraction of light using a diffraction grating spectrometer b. To measure the wavelengths of certain lines in the spectrum of the mercury arc lamp. Theory Diffraction grating is a thin film of clear glass or plastic that has a large number of lines per (mm) drawn on it.
(For this formula, with a reflection grating, you can assume ## b ## is the width of the ruling). ## \\ ## [Edit: "In principle", the order ## m ## maximum from above needs to occur inside of, really well inside of, the first zero intensity of the single slit diffraction pattern.
The experimental setup is very simple and consists in pointing the beam laser emitted from the He-Ne source on the diffraction grating. The beam undergoes diffraction and produces on the screen behind the grating the diffraction pattern with the first and second order maxima.
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