What is Grating and Grating Element?
2 Answers
  • A grating is an arrangement consisting of a large number of parallel slits of same width and separated by equal opaque spaces.

    • It is obtained by ruling equidistant parallel lines on a glass plate with the help of a diamond.
    • The lines act as opaque spaces and the incident light cannot pass through them.The space between the two lines is transparent to light and acts as a slit.
    • The spacing between the lines is of the order of wavelength of visible light.The number of a lines in a plane transmission grating is of the order of 15000 to 20000 per inch.
    • The width of each slit is a and opaque spacing between two consecutive slits is. b.
    • (a+b) is called grating element or grating constant.
    • It can be seen that distance between two consecutive slits is grating element.
  • Diffraction grating is an optical component with a periodic slits of equal

  • It is manufactured by drawing parallel lines on glass plate using a fine diamond point.

  • The etched lines act as opaque spacing and the glass between the two lines act as slit.

  • Width of each slit and the opaque space combined is called grating element.

  • Gratings are used to determine the wavelength of light by means of diffraction.

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