Also notice that the maximum intensity of the double slit is 4 units, the 3-slit case has a maximum intensity of 9 units, and for 4-slits it is 16 units, as we expect when the amplitude increases by one unit with the addition of each slit. Plane gratings are optical diffraction gratings on plane substrates. It is possible to put a large number of scratches per centimeter on the material, e.g. Notice that the bright fringes for any number of slits occur at the same places as for the double slit (provided they have the same slit separation), and that the number of dark fringes between bright fringes goes up by one every time another slit is added. A diffraction grating is made by making many parallel scratches on the surface of a flat piece of transparent material. This illustration is qualitative and intended mainly to show the clear separation of the wavelengths of light. Putting these functions into a graphing calculator confirms what we found above, as well as what we suspect about \(n\) slits – that there are \(n-1\) dark fringes between each maximally-bright fringe.įigure 3.3.3 - Comparison of Interference Patterns by Number of Slits A diffraction grating is the tool of choice for separating the colors in incident light. A diffraction grating defines an optical component with a periodic structure that splits the light into various beams that travel in different directions.
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