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The number of lines per inch of grating are written over it by the manufacturer. A diffraction grating consists of a large number of regularly spaced grooves on a substrate. The angle of diffraction $\theta$ for a particular order 'm' of the spectrum is measured. Symmetrical diffraction pattern consisting of different orders can be seen. If the light waves interact constructively we see a bright spot, and if they interact destructively we see a dark spot. The grating spectrum of the given source of monochromatic light is obtained by using a spectrometer as shown - The diffraction grating works on the principle on wave interference.

The diffraction grating is often used in the Lab for the determination of wavelength of light. Then, the distance between the centers of the adjacent slits is $d = a + b$ and is known as grating element.ĭetermination of wavelength of the spectral line using diffraction grating: However, the angular separation of the maxima is generally much greater because the slit spacing is so small for a diffraction grating. The condition for maximum intensity is the same as that for a double-slit.

Let N be the number of parallel slits, each of width 'a' and separated by opaque space 'b'. A diffraction grating is the tool of choice for separating the colors in incident light. It is obtained by ruling equidistant parallel lines on a glass plate with the help of a fine diamond point. When white light goes through a diffraction grating (diffraction glasses), different colors are bent a different angles. A diffraction grating is an arrangement consisting of a large number of parallel slits of same width and separated by equal opaque spacing.