Physics Help Forum A double-slit experiment && Optics

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 Oct 9th 2019, 09:35 PM #1 Junior Member   Join Date: Feb 2019 Posts: 7 A double-slit experiment && Optics A double-slit experiment produces fringes on a distant screen. How does the linear separation between the bright maxima on the screen change when the separation between the slits doubles? (Answer: reduces by 1/2)
 Oct 10th 2019, 07:58 AM #2 Senior Member   Join Date: Oct 2017 Location: Glasgow Posts: 474 The formula that relates the fringe characteristics to the experimental set-up is $\displaystyle \lambda = \frac{Ws}{D},$ where: $\displaystyle \lambda$ is the wavelength of your light source (in m); W is the distance between successive fringe peaks, or troughs (in m); s is the slit separation distance (in m); and D is the perpendicular distance between the slit panel and the screen. Using this formula, you should be able to solve your problem. Have a go and let us know how it goes. Most exam boards supply the above formula on the formula sheet. If not, you should learn it!

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