Posted by Leo on Saturday, June 4, 2011 at 1:10am.
What you call "single slit interfernce" is just the way the light spreads out from a single slit due to diffraction.
In a double-slit experiment, there is interfence between the two separate beams diffracting from each slit. Light spreads out at an angle determined by single-slit diffraction, but there are light and dark bands due to two-slit interference
Each double slit is in itself a single slit. That's why you see a "modulating" single slit pattern over the double slit pattern
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