Help with single slit diffraction (fraunhoffer)

  • Thread starter j-lee00
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Why( and how) does the intensity of the wave vary along a screen perpendicular to the optical axis?
 
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jtbell
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The light arriving at the screen is the superposition (sum) of waves from the various parts of the slit. In general, these waves each travel slightly different distances to reach a particular point on the screen, and so they interfere with each other. The amount of interference varies from one point to another on the screen.

Examples:

http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/fraungeo.html#c1

One way to derive the formula that gives the intensity at various points on the screen:

http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/sinint.html#c1
 

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