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Homework Help: Monochromatic Diffraction

  1. Nov 29, 2015 #1
    1. The problem statement, all variables and given/known data
    Monochromatic electromagnetic radiation of wavelength λ nm falls on double slits, creating a diffraction pattern on a screen L m away, Suppose now that the distance between the slits begins to increase at a constant rate:

    dd/dt = x μm/s.

    Assume that everything else remains unchanged. Find the rate at which the distance between the central maximum and first maximum is changing, in cm/s, at the instant the distance between the slits is d μm

    2. Relevant equations
    x = nλL/d

    3. The attempt at a solution

    x = λL/d
    dx/dt = (λL/d) * (1/ dd/dt) is this right? I am confused about dd/dt part.
  2. jcsd
  3. Nov 29, 2015 #2
    I think you want d (1/d) / dt.
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