![]() The two aspects of the grating intensity relationship can be illustrated by the diffraction from five slits. Such a multiple-slit is called a diffraction grating. When you have 600 slits, the maxima are very sharp and bright and permit high-resolution separation of the maxima for different wavelengths. If a 1 mm diameter laser beamstrikes a 600 line/mm grating, then it covers 600 slits and the resulting line intensity is 90,000 x that of a double slit.Īs the intensity increases, the diffraction maximum becomes narrower as well as more intense. ![]() The diffracted angle,, is the output angle as measured from the surface normal of the diffraction grating. Increasing the number of slits not only makes the diffraction maximum sharper, but also much more intense. The equation states that a diffraction grating with spacing will deflect light at discrete angles ( ), dependent upon the value, where is the order of principal maxima. The intensity distribution for a diffraction grating obtained with the use of a monochromatic source. The grating intensity expression gives a peak intensity which is proportional to the square of the number of slits illuminated. All wavelengths are seen at 0, corresponding to m0, the zeroth-order maximum (m1) is observed at the angle that satisfies the relationship sin /d: the second-order maximum (m2) is observed at a larger angle, and so on. Diffraction Grating Intensities Grating Intensity Comparison
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