![]() For these gratings, there are 600 lines/mm which corresponds to a grating spacing of d 1670 nanometers. ![]() where n is the order number, is the angle of diffraction, and d is the distance between grating lines. As different wavelengths leave the grating at different angles, they form a spectrum, or diffraction, order. 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. The number of orders of spectra visible with a given grating depends on the grating spacing, more spectra being visible with coarser gratings. The relationship between the wavelength of the light and the angle of diffraction is. 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. Single-order diffraction can be achieved by sinusoidal amplitude transmission grating, but the fabrication is difficult. ![]() 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 But a diffraction grating makes three sharp, distinct, first-order bright fringes, making it easy to determine the constituent colors of the incoming light. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |