Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: How do you calculate finge width without the wavelength ?

  1. Apr 14, 2010 #1
    1. The problem statement, all variables and given/known data
    Young's fringes, produced by monochromatic laser light passing through slits 0.60mm apart, are viewed on a screen. The distance accrose 20 fringe spacings on the screen is 58mm. When the screen is moved 0.80m away from the slits, the distance across 20 fringe spacings becomes 74mm.

    2. Relevant equations
    Y = D(lamda) / d
    Y = Fringe Spacing
    D = Distance from slits to screen
    d = spacing between slits
    (lamda) = Wavelength

    3. The attempt at a solution
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted