Sunday, 11 March 2018

optics - Fringe width and spacing and number of slits in diffraction experiments



In a single slit experiment, the fringes are not equally spaced and aren’t of equal widths—the central maximum is the widest, the secondary maxima grow narrower and narrower outward, and the minima grow wider and wider outward.


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In a double slit interference pattern, the fringes are equally spaced and of equal widths.


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With a diffraction grating (lots of slits), the fringes are highly focused, with small widths and unequal spacing.


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What are the reasons for the differences in fringe spacing and widths as the number of slits increases, specifically in each of the three scenarios I’ve presented above?




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