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B Help with relationships in equations ΔX/L = λ/d?

  1. Sep 29, 2016 #1
    Can someone explain to me the relationships with this equation (and probably any other equation). For example i don't fully understand how the ΔX is inversely related to the d. I have an idea of how this is so, however i can't really picture it with numbers. If you could explain the relationships and how they work that would be nice ty.
  2. jcsd
  3. Sep 29, 2016 #2


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    Staff: Mentor

    What context is this in? What does the equation describe?
  4. Sep 29, 2016 #3


    Staff: Mentor

    The equation in the thread title (which should be here in your post) is
    $$\frac{\Delta x}{L} = \frac{\lambda}{d}$$
    I'm assuming that L and ##\lambda## are constants in this equation.
    If you double d, the result is that ##\Delta x## is halved. If you triple d, ##\Delta## becomes 1/3 of its former value. That's what inversely related means.
  5. Sep 29, 2016 #4
    My guess is that a plane wave of wavelength lambda impinges on a opaque screen with a hole of size d. The outgoing diffraction pattern has an angle of about lamda/d. Another screen , at L meters from the first one (really far), is used to observe the diffraction pattern. delta_x is the approximate size of the main diffraction lobe.
    I'd like to see the original context
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