A. John Mallinckrodt   Professor of Physics, Cal Poly Pomona
Interference
Interference Patterns of Two Point Sources
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The following animated gifs illustrate the patterns of constructive and destructive interference that are produced by two point sources. For sources of the same frequency, increasing the source separation increases the spatial frequency of the beams of constructive interference. Sources of different frequency produce a spatial pattern that changes at the beat (difference) frequency of the sources.

sep=1
sep=2
sep=4
Source separation
1 wavelength
Source separation
2 wavelengths
Source separation
4 wavelengths

freq ratio = 5/4
Right frequency = 5/4 Left frequency

 

©2001 by A. John Mallinckrodt
ajm at csupomona.edu
http://www.csupomona.edu/~ajm

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The space for this page is provided by Cal Poly Pomona and is subject to its policies. Nevertheless, the opinions expressed here are my own and do not necessarily represent official policy of the University. I take full responsibility for the information presented and will appreciate being informed of errors or inaccuracies.

Last modified on 5 February, 2004