# Help with single slit diffraction (fraunhoffer)

urgent Help with single slit diffraction (fraunhoffer)

why is it a minimum at a*sin ($$\theta$$) = m*$$\lambda$$,

a = slit separation

I would have thought if the path difference is equal to a whole wavelength then there would be constructive interference??

See http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html

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