Physics Help Forum Double slit diffraction

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 Jun 19th 2010, 01:37 AM #1 Junior Member   Join Date: Feb 2010 Posts: 5 Double slit diffraction Ello, This is my question, In a double slit experiment using monochromatic light and two slits 0.50mm apart, it was found that the second dark band was 3.6mm from the centre of the central maximum on teh screen. If th screen was 1.9m from the slits, what was the wavelength of the light used? I know that I have to use this equation: x=lambdaL/d I know these values: lambda=? (what I need to find) L=1.9m d=5*10^-04 But I don't know what x is. Could someone please help me find the value for x. Thanks heaps for your help physics help forum. Last edited by Awsom Guy; Jun 19th 2010 at 01:38 AM. Reason: sorry i stuffed up latex for lambda
 Jun 19th 2010, 03:52 AM #2 Senior Member   Join Date: Dec 2008 Location: Udupi, Karnataka, India Posts: 292 What is 3.6mm?
 Jun 20th 2010, 12:58 AM #3 Junior Member   Join Date: Feb 2010 Posts: 5 don't worry I got the answer, btw 3.6mm is the inteference thing as in the dark band and bright band thing. thus w=3.6 * 3/2. The equation there is wrong this is the right equation w=lambdax/D

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