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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. Diffraction grating happens when the light hits an obstacle with uniformly distributed apertures. Then, the rays get diffracted - each of them goes in a slightly different direction. The effects of diffraction are only visible if the spacing between apertures is larger than the wavelength of the incident ray. A diffraction grating consists of a large number of evenly spaced parallel slits that produce an interference pattern similar to but sharper than that of a double slit. Constructive … : Diffraction Gratings - Physics LibreTexts Theory of Diffraction Grating A monochromatic light beam that is incident on a grating gives rise to a transmitted beam and various diffracted beams , at angles that depend on the ratio between the distance between the lines of the grating and the wavelength of the light. 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. Diffraction grating is a useful device for analyzing light sources.It consists of a large number of equally spaced parallel slits.

  • Intensity of subsidary maxima in a diffraction grating

    Such a grating can be thought of as the product of a "top hat" function and an infinite grating, and the diffraction pattern will be the convolution of the Fourier transforms of those two apertures (this is the convolution theorem "in the other direction").

    Diffraction gratings are used to disperse light; that is to spatially separate light of different wavelengths. They have replaced prisms in most fields of spectral analysis. The manufacture 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 .