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Physics Chapter 36: Diffraction and Interference

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Terms in this set (12)

  • What does the letter \(a\) represent in diffraction?
    Slit width
  • What does the letter \(d\) represent in diffraction?

    Slit separation or distance between layers in X-ray diffraction

  • What can the letter \(n\) stand for?
    Index of refraction or number of slits per unit length
  • What do the variables \(n\) and \(m\) count?

    𝑛: how many slits per unit length; π‘š: number of maximum or minimum for pattern on screen)

  • How do you calculate slit separation \(d\) when given \(n\) (number of slits per unit length)?
    \(d=\frac{1}{n}\)

  • Location of minima on a single slit diffraction pattern

    \(a\sin\theta = m\lambda\)

  • Location of maxima on a single slit diffraction pattern

    \(a\sin\theta = (m+\frac{1}{2})\lambda\)

  • The position on the screen related to the diffraction angle?

    \(\tan\theta = \frac{y}{L}\)

  • Location of maxima in a diffraction grating pattern

    \(d\sin\theta = m\lambda\)

  • Location of maxima in X-ray diffraction

    \(2d\sin\theta = m\lambda\)
  • Minimum angle to resolve two sources (Rayleigh criterion)

    \(\sin\left(\theta_{Min}\right)=1.22\frac{\lambda_{n}}{D}\)

  • Wavelength of light in a medium with index of refraction \(n\)

    \(\lambda_n = \frac{\lambda_0}{n}\)