Ch24_part2

# Ch24_part2 - Chapter 24 part 2 PHY213 Diffraction Huygen's...

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Chapter 24, part 2 PHY213 1 Diffraction s Huygen’s principle requires that the waves spread out after they pass through slits s This spreading out of light from its initial line of travel is called diffraction s In general, diffraction occurs when waves pass through small openings, around obstacles or by sharp edges Diffraction, 2 s A single slit placed between a distant light source and a screen produces a diffraction pattern s It will have a broad, intense central band s The central band will be flanked by a series of narrower, less intense secondary bands s Called secondary maxima s The central band will also be flanked by a series of dark bands s Called minima Diffraction, 3 s The results of the single slit cannot be explained by geometric optics s Geometric optics would say that light rays traveling in straight lines should cast a sharp image of the slit on the screen Single Slit Diffraction s Each portion of the slit acts as a source of waves s The light from one portion of the slit can interfere with light from another portion s The resultant intensity on the screen depends on the direction θ

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Chapter 24, part 2 PHY213 2 Single Slit Diffraction, 2 s All the waves that originate at the slit are in phase s Wave 1 travels farther than wave 3 by an amount equal to the path difference (a/2) sin θ s If this path difference is exactly half of a wavelength, the two
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Ch24_part2 - Chapter 24 part 2 PHY213 Diffraction Huygen's...

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