PY208N-Lecture-34

# PY208N-Lecture-34 - Physics 208N-004 Lecture#34 13 April...

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1 Chapter 35 Diffraction and Polarization Diffraction by a Single Slit or Disk Intensity in Single-Slit Diffraction Pattern Diffraction in the Double-Slit Experiment Limits of Resolution; Circular Apertures Resolution of Telescopes and Microscopes; the λ Limit Resolution of the Human Eye and Useful Magnification Diffraction Grating Physics 208N-004 Lecture #34 – 13 April 2011 Chapter 35: 1, 3-5, 7 Diffraction Light is a wave, it will diffract around edges of an obstacle. 35-1 Diffraction by a Single Slit or Disk The resulting pattern of light and dark stripes is called a diffraction pattern.

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2 This pattern arises because different points along a slit create wavelets that interfere with each other just as a double slit would. 35-1 Diffraction by a Single Slit or Disk The minima of the single-slit diffraction pattern occur when 35-1 Diffraction by a Single Slit or Disk
3 35-1 Diffraction by a Single Slit or Disk Example 35-1: Single-slit diffraction maximum. Light of wavelength 750 nm passes through a slit 1.0 x 10 -3 mm wide. How wide is the central maximum (a) in degrees, and (b) in centimeters, on a screen 20 cm away? 35-1 Diffraction by a Single Slit or Disk Conceptual Example 35-2: Diffraction spreads. Light shines through a rectangular hole that is narrower in the vertical direction than the horizontal. (a) Would you expect the diffraction pattern to be more spread out in the vertical direction or in the horizontal direction? (b) Should a rectangular loudspeaker horn at a stadium be high and narrow, or wide and flat?

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4 35-2 Intensity in Single-Slit Diffraction Pattern Light passing through a single slit can be divided into a series of narrower strips; each contributes the same amplitude to the total
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PY208N-Lecture-34 - Physics 208N-004 Lecture#34 13 April...

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