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Double Slit experiments

  1. Feb 4, 2017 #1
    1. The problem statement, all variables and given/known data
    A double-spit experiment is performed with light of wavelength 600 nm. A wide viewing screen is 2m behind the grating. What is the distance between the two m=2 bright fringes on the screen? The slit separation given is 0.1 mm.

    2. Relevant equations
    Given the wavelength and distance I am assuming y = mλL/d makes the most sense for the equation to solve this problem.

    3. The attempt at a solution
    I make d=(.1*10^-3)
    Wavelength given=600 nm so I make that (600*10^-9)
    and my distance and screen are both 2 so I enter the equation as:
    = (2.4*10^-2) mm as my solution. It looks weird as an answer though. Did I tackle this problem correctly?
  2. jcsd
  3. Feb 4, 2017 #2


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    What are the units for d and all the other numbers you calculated? Why do you say the final answer is in mm?
  4. Feb 4, 2017 #3
    d is the distance so its unit would be m and i assumed the final answer would be nm because I would be measuring the final distance in terms of wavelength?
  5. Feb 4, 2017 #4


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    In this equation, put units next to each number and see what comes out.
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